I am an adult Catholic

adult-catechism

I am an adult, committed, thinking Christian in the Roman Catholic tradition.

I am committed to Gospel living, justice, love of neighbor, and my God.

I love my Church, its history, traditions, teaching, richness, diversity, and believe it, ultimately, a force for good in the world.

I am committed to understanding, in an adult way, the issues, challenges, and problems my Church faces, and commit myself to improving the situation for her benefit.

Therefore, I believe my Church worthy of my best effort. When my brothers and sisters question why I am doing what I am doing and say they don’t understand my actions, I am happy to try and explain.

I respect ecclesial authority when that authority manifests itself in actions in harmony with Gospel values.

As an adult and aware that sin exists in the world, I am well acquainted with human failings, in myself and others, to live up to those Gospel values.

My God calls me to forgive and I do. I can recognize the distinction between justice and injustice. I can tell when injustice is rooted in institutional structures.

As a Christian, I know, because my Church teaches me so, it is my duty and obligation to resist and to try to change, with all my strength and to invoke the aid of God, those structures which result in injustice.

I cannot stand by while the weakest and most vulnerable among us are afflicted.

I seek to return my Church to its often held moral leadership in society, for the benefit of society, myself, and my neighbor.

I believe this is God’s will for me.

I am an adult Catholic.

“It is easier to build strong children than to repair broken men”
-Frederick Douglas

(c) 2009, Matthew P. McCormick
All rights reserved.

Satan’s tools

There is a story about Satan selling some of his tools at a garage sale he was giving. There on tables grouped by importance were his bright, shiny but deadly trinkets.

One could find tools that made it easy to tear others down.  And for those who had big egos, there were lenses for magnifying one’s own importance, but if you looked through them the other way, you could also use the lens to belittle others.

An unusual assortment of gardening implements stood together with a guarantee to help your pride grow by leaps and bounds.  Also in prominence was the rake of scorn, the shovel of jealousy for digging a pit for your neighbor, tools of gossip and backbiting, of selfishness and apathy.

All of these were pleasing to the eye and came complete with great promises and guarantees of prosperity.  The prices, of course, were steep but a sign declared “Free Credit Extended” to all.  “Take at least one home, use it.  You don’t have to pay until later!” old Satan cried rubbing his hands in glee.

One prospective buyer was looking at all the things offered when he noticed two well-worn, non-descript tools standing in one corner.    Not being nearly as tempting as the other items, he found it curious that these two tools had price tags higher than any other.

When he asked why, Satan just laughed and said, “Well, that’s because these two are more useful to me than the others.  I can pry open and get inside a person’s heart with these when I cannot get near them with my other tools. Once I get inside, I can make people do what I choose. They are badly worn because I use them on almost everyone, since very few people know that they belong to me.”

Satan pointed to the two tools, saying, “You see, I call that one Doubt and the other Discouragement. Those will work when nothing else will.”

“I raise my eyes toward the mountains. From whence will my help come?
My help comes from the LORD, Who made heaven and earth.”  Ps 121:1-2

Love,
Matthew

Prayer to the Teenager Jesus

Jesus, you were a teenager.
You know what it’s like to struggle with identity, authority, sexuality.
You know what it’s like to want to figure it all out; what it’s like to not be sure, to live with uncertainty.
You know what it’s like to want freedom and respect.
You know what it’s like to struggle to accept responsibility.
You know what it’s like to feel and to actually be awkward and what that feels like.
You know what it’s like to be humble enough to learn from and respect Mary and Joseph.
You know what it’s like when Joseph and Mary drove You crazy, and You made them crazy, too.
You know what it’s like to work hard to make wise choices.
You know what it’s like to forgive Yourself when You don’t.
You know what it’s like to want to be liked, to be popular.
You know what it’s like to be made fun of when you’re not, because You were different.
You know what it’s like for your body to change, to suffer zits.
You know what it’s like to be embarrassed, when Your voice changes.
You know what it’s like to like someone else, and the hurt of not being liked in return.

Jesus, You know all these things.
You know where I’m coming from.
Help me to ask You to be my friend.
Help me to realize my friendship with You is very much like my friendship with any other teenager.
That it grows with the time we spend together.

Help me to find the time to get to know you better, Lord; to spend time with You and Your Word, especially in prayer.
Help me to know how to pray, and that it’s ok if sometimes I don’t.  You’re cool with it.
Help me to trust You, Lord.
Help me to be patient, Lord, with You, with myself, with my parents, my brothers and sisters, my friends, my teachers.
Keep me safe from all the dangers I see, hear about, or encounter at school, when I’m hanging out with my friends, or on the internet.
Help me to remember I probably really don’t completely understand how much my parents love me; and that they always do, even if they don’t always tell me directly, or especially when they’re mad at me or I’m mad at them.
Help me to understand it’s hard for my parents to put into words how much they love me, just like when it’s hard for me to put into words how I feel when I have strong emotions.
Help me to remember how much they and You love me when I’m at a party and everybody’s drinking.
Help me to remember how much they and You love me so I won’t drink and drive.
Help me to remember how much they and You love me so I won’t accept a ride when someone else has been; to call home instead for a ride, even if I’ll get in trouble, but that that’s way better by far, and someday I’ll understand why.
Help me to remember how much they and You love me when some kid wants to sell me or give me drugs in the locker room or behind school.
Help me to remember not everyone on the internet, especially someone I don’t know, really wants what’s best for me.
Help me to remember while having fun and sharing with my friends on the internet, that not absolutely everything about me must be posted, that a little mystery makes me more interesting and safer.
Give me the courage, Lord, to say “no” even when other people may not think that’s cool.
Help me to wonder and to choose what You think would be cool and to do that instead.
Help me to know that if we’re best friends and I choose to do what You think is cool, it really doesn’t matter what other people think
about me.  That’s what being best friends is all about.
Help me to know it’s not me setting the timing, but You, Lord.
Help me trust You, Lord, that You are Who everyone says You are, the best friend I could ever have.
Help me to be patient enough to allow that to happen.
I do believe that is Your will for me.

Amen.

(c) 2008, Matthew P. McCormick.  All rights reserved.

The Returning Master

“Gird your loins and light your lamps and be like servants who await their master’s return from a wedding, ready to open immediately when he comes and knocks.  Blessed are those servants whom the master finds vigilant on his arrival.

Amen, I say to you, he will gird himself, have them recline at table, and proceed to wait on them.   And should he come in the second or third watch and find them prepared in this way, blessed are those servants.

Be sure of this: if the master of the house had known the hour when the thief was coming, he would not have let his house be broken into.  You also must be prepared, for at an hour you do not expect, the Son of Man will come.”

Then Peter said, “Lord, is this parable meant for us or for everyone?”

And Jesus replied, “Who, then, is the faithful and prudent steward whom the master will put in charge of his servants to distribute (the) food allowance at the proper time?  Blessed is that servant whom his master on arrival finds doing so.  Truly, I say to you, he will put him in charge of all his property.

But if that servant says to himself, ‘My master is delayed in coming,’ and begins to beat the menservants and the maidservants, to eat and drink and get drunk, then that servant’s master will come on an unexpected day and at an unknown hour and will punish him severely and assign him a place with the unfaithful.

That servant who knew his master’s will but did not make preparations nor act in accord with his will shall be beaten severely; and the servant who was ignorant of his master’s will, but acted in a way deserving of a severe beating shall be beaten only lightly.

Much will be required of the person entrusted with much, and still more will be demanded of the person entrusted with more.”

-Luke 12:35-48

Love,
Matthew

Who is going to save our Church?

“If any man should deny the Divine origin of the Roman Church, let it be known that no mere human institution conducted with such knavish imbecility could have lasted a fortnight.”
-author Hillaire Belloc (1870-1953)
“Who is going to save our Church? Not our bishops, not our priests and religious.  It is up to you, the people. You have the minds, the eyes, the ears to save the Church.  Your mission is to see that your priests act like priests, your bishops, like bishops,  and your religious act like religious.”
-Archbishop Fulton J. Sheen, before the Knights of Columbus, June 1972
“I consider all religions equal. And by equal, I mean they’re all tied for second place behind Catholicism.”
– Stephen Colbert

“Intellectual Tasks of the New Evangelization”, 9/15-17/11, Wash, DC

by JOAN FRAWLEY DESMOND, Sr Editor, National Catholic Register, 09/21/2011
WASHINGTON — Seeking to reverse a generational breakdown in the transmission of faith, the U.S. bishops have targeted a potential ally — young theologians who have just begun to teach undergraduates at Catholic universities… 
…“The Intellectual Tasks of the New Evangelization,” a symposium held here at the Washington Court Hotel, provided a forum for 54 untenured theologians from across the country to engage with Church leaders and prominent theologians, including Archbishop J. Augustine DiNoia, secretary of the Congregation for Divine Worship and the Discipline of the Sacraments; John Cavadini, a top theologian at the University of Notre Dame; and Janet Smith, a moral theologian at the Sacred Heart Major Seminary in Detroit.
In a homily that introduced a note of urgency, Cardinal Wuerl suggested that theology departments and religious-studies departments address both the needs of cradle Catholics who never learned “the essentials of the faith” and the disaffection of mainstream society, for whom “the Gospel has lost its taste, its freshness, its luster.”
Sounding a theme echoed in other presentations over the weekend, Cardinal Wuerl asked the young academics — most of whom had completed their doctorates within the past five years — to embrace their professional responsibilities as a spiritual calling, embodying the teachings they transmitted.
The symposium marked a renewed focus on the New Evangelization by Church leaders throughout the world.
“Vast horizons are opening to the announcement of the Gospel, while regions of ancient Christian tradition are called to rediscover the beauty of the faith,” stated Pope Benedict XVI in a Sunday Angelus address delivered Sept. 18.
At the symposium, Archbishop DiNoia explored related themes in an often passionate address. The work of a Catholic theologian “is not simply an academic vocation. It is an ecclesial vocation,” he stated. The task at hand required an affirmation of the “doctrinal core of the Catholic faith” and a concerted effort to address the “internal and external factors” that impede the New Evangelization.
He counseled his audience not to allow academic specialization and speculative work to lead them to ignore the fullness of the Church’s teaching.
Archbishop DiNoia, a member of the Order of Preachers, observed that St. Thomas Aquinas mastered every aspect of Catholic theology and would never have divided it up into patristics, systematic theology, bioethics and other areas of specialization.
The fragmentation of theological work has resulted in the weakening of the holistic vision and power of Revelation, he said. “You have to keep asking yourself: What does this have to do with … the central doctrines of the faith?” he said. “The part you specialize in relates to the whole.”
Archbishop DiNoia touched on the sensitive topic of episcopal oversight of theology departments at Catholic universities and colleges. While acknowledging that scholars “have an instinctive allergy with regard to any censorship of thought,” he insisted that the Church had an obligation to confront theological dissent.
Internal Secularization
He noted that the need for intervention by Church authorities has increased over time: “The more theologians are no longer reliably able to affirm what the doctrine means, the more the magisterium intervenes.”
A central obstacle to the New Evangelization, he asserted, was the “internal secularization of the Church. The enemy occupies our territory.” The steady advance of secularism has fueled doubts about the intelligibility of the faith, resulting in an “apologetic apologetics.”
In contrast, Blessed Pope John Paul II “muted nothing,” the archbishop said. And Pope Benedict XVI’s public witness reflects the conviction that Catholic teaching presented in its “entirety can’t fail to attract.” 
Janet Smith, a leading moral theologian and author who has emerged as a prominent exponent of Blessed John Paul II’s theology of the body, examined how his emphasis on personalism contributed to the contemporary appeal of moral-law theology. The late Holy Father focused not only on general truths, but on challenging each person to realize that they need to live in accord with the truth.
She asked her audience to take a closer look at the late Pope’s emphasis on “lived experience.” In a world that expresses a “need for community but also an internal need for intimacy,” his message resonates with young people, leading them to reassess their relationships and learn self-mastery for the good of another person. 
Examination of Conscience
She likened her students’ encounter with Blessed John Paul II’s seminal work Love and Responsibility to an “examination of conscience.” The theology of the body “establishes that man can learn from the makeup of his own body and … that man is meant to be in a loving relationship of persons” imaging the communion of the Trinity.
Smith encouraged her audience to present the countercultural truths contained in Humanae Vitae (The Regulation of Birth) in an engaging manner that would lead students to ask themselves: “Am I speaking the truth of the body with my acts?”
While Smith mined the theological legacy of a 20th-century Pope, John Cavadini, a leading American theologian who stepped down last year as the chairman of the University of Notre Dame’s theology department, focused on the enduring insights contained in ancient texts of Catholic apologetics.
Cavadini began his presentation with a quote from Contra Celsum by Origen, the leading theologian of the early Eastern Church: “Our Savior and Lord Jesus Christ was silent when false witnesses spoke against him and answered nothing when he was accused; he was convinced that all his life and actions … were better than any speech in refutation of the false witness and superior to any words that he might say in reply to the accusations.”
Painting of an Icon
Origen’s insight provides worthy guidance for advancing the New Evangelization because it “lifts apologetics far beyond mere defensive tactics and into an offensive strategy that lays out a new vista for the theological imagination,” Cavadini suggested.
“Origen’s argumentation serves not to substitute for the peculiar power of the Gospel, but to make distinctions so that the way can be cleared for the weak Christian or the non-Christian to encounter and contemplate that power” on their own. He continued. “Origen’s apology is very aptly compared to the painting of an icon which is intended, in later Greek Christianity, to mediate an encounter with the Person of Christ.”
Cavadini asked his audience to “reread and study the great classical and medieval apologetic treatises, specifically with a mind towards discerning their apologetic strategy as a useful resource for today.” The recommended texts included: “Justin Martyr’s two Apologies, the Contra Celsum of Origen, the City of God of St. Augustine [and] the Summa Contra Gentiles of Thomas Aquinas.”
In an interview during a break in the proceedings, Cardinal Wuerl described the symposium as an opportunity for “building relationships among bishops and the theological community in an atmosphere of th
eological discussion. The New Evangelization is calling for us to take a look at how we re-propose the Gospel message to people who may feel they have already heard that message and it has nothing to say to them.”
Chad Pecknold, an assistant professor of systematic theology at The Catholic University of America and the author of Christianity and Politics: A Brief Guide to the History, published in 2010, was among the invited participants who represent a new generation of theologians who are prepared to take the New Evangelization to heart.
In the wake of the Second Vatican Council, he said, during an interview, theologians sought to dislodge the doctrinal certainties that anchored the faith of their students and “open” them up to new insights.
But today, there is no longer a “sense that the Second Vatican Council constituted a break with the past. The intellectual task of the New Evangelization is to think through the continuity of evangelization.”
Read more: http://www.ncregister.com/daily-news/young-theologians-encouraged-to-confront-the-intellectual-tasks-of-the-new-/#ixzz1Z1KEBP5L

Sola fides? Are you Saved? I’m working on it. I hope so.

philippians-2-2-word-our-your-salvation-white-copy

Phil 2:12

-by Patricia May, Arkansas Catholic, 3/26/11

“Many Catholics, especially those living in the South, have heard the question posed by Protestants. Unprepared by the Church to properly answer, they often shrug off the question or walk away.

But Catholics should not only respond, they ought to engage their questioners in discussion. That’s the position of Dr. C. Colt Anderson, dean of Washington Theological Union in Washington, D.C., and the featured speaker March 10 at St. Thomas Aquinas University Parish’s third annual theology lecture.

Originally from Georgia, Anderson said he’s faced the question. He asked the audience of mostly college students to answer, “Are you saved?” “Working on it,” responded one listener. A pretty good answer, Anderson acknowledged. Better, he said, is the response: “I hope so.”

Catholic doctrine supplies the proper foundation for response, Anderson said, and Catholics should be confident answering. “We can say we have hope, strong hope (that we’re saved), but we can’t know for sure.”

To believe one is saved is to risk a potentially dangerous smugness. “If we knew for sure (that we’re saved), it could lead to spiritual self-satisfaction … the equivalent of spiritual death,” Anderson explained. That’s because God expects us to continually grow. “We’re called to grow into being like Christ.”

He continued, “Ask yourself: Am I more faithful now than I was a year ago? Do I have more hope? Am I more loving now than I was?” Catholics must constantly be increasing in faith, hope and love, Anderson said.

“It’s not enough to think kind thoughts about hungry people. We must do something for them,” he explained.

Anderson cited references from the Council of Trent, the Catholic Church’s response to the Protestant Reformation, in his explanations. “Why don’t we make the effort to engage people about what we consider (to be) important?” He challenged listeners that, if they really believe in the possibility of eternal damnation as well as Christ’s admonition to love your neighbor, “You can’t just walk away from the question.”

To show they really care, Catholics “should try to help them.” They should explain that each person is given a gift of grace from God along with the freedom to accept it (and to love and grow in that grace), or to reject it. But, “How often do we fail to share our faith?”

And what about loving all people?

“We have to love the worst people. … We should love racists … violent people … greedy people because Christ came and loved all of us,” Anderson continued.

Just as individuals have different talents and gifts, so may the graces they receive differ, Anderson said. As an example, he noted that St. Francis of Assisi called himself the worst sinner in the world. A follower disagreed, pointing out the good Francis had done. The Italian saint demurred, saying that if the worst sinner got the grace I’ve got, he would have done a better job with it.

“Good things come from God. Sins are ours, but we don’t want to give them up,” Anderson continued.

Faith alone is not enough to save us, Anderson said. The gifts of faith, hope and love reflect the triad of the Trinity, he said, and “The Scriptures are on our side.” St. James said “Faith without works is dead.”

Asked for his thoughts on purgatory, Anderson said he doesn’t know what purgatory is, but it may be a place where “unfinished business has to be dealt with.” Sins are forgiven but there may still be lasting damage from those sins that must be addressed.

“You’re given absolution from your sins but you’ve done damage. … Some effort has to be made … Unfinished business has to be dealt with before you get into heaven,” he said.

Traditionally, Catholics have been taught to pray for the dead in purgatory — until now. “We haven’t taught this generation to pray for us,” he said.

But, Anderson said he’ll pray for people he thinks may be in purgatory. After all, “It doesn’t do any harm to pray.”

last_judgment
-Michaelangelo’s “Last Judgment”, Sistine Chapel

Love,
Matthew

Jun 22 – St Thomas More, (1477-1535 AD), Martyr, Husband & Father

Hans_Holbein,_the_Younger_-_Sir_Thomas_More_-_Google_Art_Project

-by Hans Holbein the Younger, 1527

“omnium horarum homo” -a man for all seasons, referring to his wide scholarship and knowledge

Excerpts taken from “Married Saints” by John F. Link, pp 1-3; 6-15.

“…[Thomas] More is known in literary circles as one of the best authors of the Renaissance.  He was widely known as both a poet and an author…The most famous of his works was Utopia, the literary masterpiece he wrote when he was 39 years old.  Its publication opened the doors to other literary figures of his time…More hosted mainly literary figures and educators in his home; one of the things he was known for was his talents as a host.

More was born on February 7, 1477 in London, to John and Agnes More.  His mother died when he was a child and was not an influence on him.  His father, though, was.  Like his son Thomas would become, John More was a lawyer.  He attended very closely to Thomas’ personal and professional development.  Left to his own preferences, Thomas would not have become a lawyer since his preferences in school were for theology and the other liberal arts – literature, history, and philosophy.  Like many scholars of his time, he became fluent in both Latin and Greek.  In fact, he wrote Utopia in Latin for the intelligentsia of Europe.  It was translated into English after his death.

Thomas studied at Oxford from age 14 to 16, was a pre-law student in London from 16 to 18, a law student from 18-23, and admitted to the bar at 23…More also entered politics, being elected a member of Parliament at age 27 by the merchants who were his clients.  His reputation as a lawyer grew, especially his reputation for honesty and integrity.

By the time More reached his 40’s, he had become the most successful lawyer in England.  Because of his reputation for integrity and prudent judgment, both as a lawyer and as a judge, More’s law practice grew enormously and he became quite wealthy.  More’s reported income was 400 pounds sterling per year.  A substantial amount, considering ordinary people in London of that time lived on ten pounds sterling per year.

More’s career continued to spiral upward.  At age 46 he was elected Speaker of the House of Commons. At 52, Henry VIII appointed him Lord Chancellor of England, the highest appointed office in the country.

At 58, More refused to approve Henry’s divorce from Catherine of Aragon and remarriage to Anne Boleyn, as the Lord Chancellor, chief judge and legal authority of the nation, was required to do to make the divorce legal and the remarriage possible. Thomas was forced to resign, eventually imprisoned, and on July 6, 1535 was executed for treason by beheading.

More’s last prayer was the Miserere, Psalm 51:

“Miserere mei, Deus, secundum magnam misericordiam tuam…Have mercy upon me, O God, according to thy loving kindness…”

“What does it avail to know that there is a God, which you not only believe by Faith, but also know by reason: what does it avail that you know Him if you think little of Him?”
– Saint Thomas More

“Occupy your minds with good thoughts, or the enemy will fill them with bad ones. Unoccupied, they cannot be.” -St. Thomas More

“Although I know well, Margaret, that because of my past wickedness I deserve to be abandoned by God, I cannot but trust in His merciful goodness. His grace has strengthened me until now and made me content to lose goods, land, and life as well, rather than to swear against my conscience.

God’s grace has given the king a gracious frame of mind toward me, so that as yet he has taken from me nothing but my liberty. In doing this His Majesty has done me such great good with respect to spiritual profit that I trust that among all the great benefits he has heaped so abundantly upon me I count my imprisonment the very greatest. I cannot, therefore, mistrust the grace of God.

By the merits of His bitter passion joined to mine and far surpassing in merit for me all that I can suffer myself, His bounteous goodness shall release me from the pains of purgatory and shall increase my reward in heaven besides.

I will not mistrust Him, Meg, though I shall feel myself weakening and on the verge of being overcome with fear. I shall remember how Saint Peter at a blast of wind began to sink because of his lack of faith, and I shall do as he did: call upon Christ and pray to Him for help. And then I trust He shall place His holy hand on me and in the stormy seas hold me up from drowning.

And finally, Margaret, I know this well: that without my fault He will not let me be lost.

I shall, therefore, with good hope commit myself wholly to Him. And if He permits me to perish for my faults, then I shall serve as praise for His justice. But in good faith, Meg, I trust that His tender pity shall keep my poor soul safe and make me commend His mercy.

And, therefore, my own good daughter, do not let your mind be troubled over anything that shall happen to me in this world. Nothing can come but what God wills. And I am very sure that whatever that be, however bad it may seem, it shall indeed be the best. – from a letter written by Saint Thomas More from prison to his daughter Margaret

thomasmore

Prayer to St Thomas More

St Thomas More, counselor of law and statesman of integrity, merry martyr and most human of saints: Pray that, for the glory of God and in the pursuit of His justice, I may be trustworthy with confidences, keen in study, accurate in analysis, correct in conclusion, able in argument, loyal to clients, honest with all, courteous to adversaries, ever attentive to conscience. Sit with me at my desk and listen with me to my clients’ tales. Read with me in my library and stand always beside me so that today I shall not, to win a point, lose my soul.

Pray that my family may find in me what yours found in you: friendship and courage, cheerfulness and charity, diligence in duties, counsel in adversity, patience in pain—their good servant, and God’s first.

Amen.

Love,
Matthew

Roman Catholic cleric-scientists/engineers


-Nicolaus Copernicus

A
José de Acosta (1539–1600) – Jesuit missionary and naturalist who wrote one of the first detailed and realistic descriptions of the new world
François d’Aguilon (1567–1617) – Belgian Jesuit mathematician, architect, and physicist, who worked on optics
Lorenzo Albacete (1941–2014) – priest, physicist, and theologian
Albert of Castile (c. 1460-1522) – Dominican priest and historian.
Albert of Saxony (philosopher) (c. 1320–1390) – German bishop known for his contributions to logic and physics; with Buridan he helped develop the theory that was a precursor to the modern theory of inertia
Albertus Magnus (c. 1206–1280) – Dominican friar and Bishop of Regensburg who has been described as “one of the most famous precursors of modern science in the High Middle Ages.”Patron saint of natural sciences; Works in physics, logic, metaphysics, biology, and psychology.
Giulio Alenio (1582–1649) – Jesuit theologian, astronomer and mathematician; was sent to the Far East as a missionary and adopted a Chinese name and customs; wrote 25 books, including a cosmography and a Life of Jesus in Chinese.
José María Algué (1856–1930) – priest and meteorologist who invented the barocyclonometer
José Antonio de Alzate y Ramírez (1737–1799) – priest, scientist, historian, cartographer, and meteorologist who wrote more than thirty treatises on a variety of scientific subjects
Francesco Castracane degli Antelminelli (1817–1899) – priest and botanist who was one of the first to introduce microphotography into the study of biology
Giovanni Antonelli (1818–1872) – priest and astronomer who served as director of the Ximenian Observatory of Florence
Luís Archer (1926-2011) – Portuguese molecular biologist and editor of the journal Brotéria from 1962 to 2002
Nicolò Arrighetti (1709–1767) – Jesuit who wrote treatises on light, heat, and electricity
Mariano Artigas (1938–2006) – Spanish physicist, philosopher and theologian
Giuseppe Asclepi (1706–1776) – Jesuit astronomer and physician who served as director of the Collegio Romano observatory; the lunar crater Asclepi is named after him
B
Roger Bacon (c. 1214–1294) – Franciscan friar who made significant contributions to mathematics and optics and has been described as a forerunner of modern scientific method
Bernardino Baldi (1533–1617) – abbot, mathematician, and writer
Eugenio Barsanti (1821–1864) – Piarist, possible inventor of the internal combustion engine
Bartholomeus Amicus (1562–1649) – Jesuit, wrote on philosophy, mathematics, astronomy, and the concept of vacuum and its relationship with God
Daniello Bartoli (1608–1685) – Bartoli and fellow Jesuit astronomer Niccolò Zucchi are credited as probably having been the first to see the equatorial belts on the planet Jupiter
Joseph Bayma (1816–1892) – Jesuit known for work in stereochemistry and mathematics
Giacopo Belgrado (1704–1789) – Jesuit professor of mathematics and physics and court mathematician who did experimental work in electricity
Michel Benoist (1715–1774) – missionary to China and scientist
Mario Bettinus (1582–1657) – Jesuit philosopher, mathematician and astronomer; lunar crater Bettinus named after him
Giuseppe Biancani (1566–1624) – Jesuit astronomer, mathematician, and selenographer, after whom the crater Blancanus on the Moon is named
Jacques de Billy (1602–1679) – Jesuit who has produced a number of results in number theory which have been named after him; published several astronomical tables; the crater Billy on the Moon is named after him
Paolo Boccone (1633–1704) – Cistercian botanist who contributed to the fields of medicine and toxicology
Bernard Bolzano (1781–1848) – priest, mathematician, and logician whose other interests included metaphysics, ideas, sensation, and truth
Anselmus de Boodt (1550–1632) – Canon who was one of the founders of mineralogy
Theodoric Borgognoni (1205–1298) – Dominican friar, Bishop of Cervia, and medieval Surgeon who made important contributions to antiseptic practice and anaesthetics
Christopher Borrus (1583–1632) – Jesuit mathematician and astronomy who made observations on the magnetic variation of the compass
Roger Joseph Boscovich (1711–1787) – Jesuit polymath known for his contributions to modern atomic theory and astronomy and for devising perhaps the first geometric procedure for determining the equator of a rotating planet from three observations of a surface feature and for computing the orbit of a planet from three observations of its position
Joachim Bouvet (1656–1730) – Jesuit sinologist and cartographer who did his work in China
Michał Boym (c. 1612–1659) – Jesuit who was one of the first westerners to travel within the Chinese mainland, and the author of numerous works on Asian fauna, flora and geography
Thomas Bradwardine (c. 1290–1349) – Archbishop of Canterbury and mathematician who helped develop the mean speed theorem; one of the Oxford Calculators
Martin Stanislaus Brennan (1845–1927) – priest and astronomer who wrote several books about science
Henri Breuil (1877–1961) – priest, archaeologist, anthropologist, ethnologist and geologist
Jan Brożek (1585–1652) – Polish canon, polymath, mathematician, astronomer, and physician; the most prominent Polish mathematician of the 17th century
Louis-Ovide Brunet (1826–1876) – priest, one of the founding fathers of Canadian botany
Ismaël Bullialdus (1605–1694) – priest, astronomer, and member of the Royal Society; the Bullialdus crater is named in his honor
Jean Buridan (c. 1300 – after 1358) – priest who formulated early ideas of momentum and inertial motion and sowed the seeds of the Copernican revolution in Europe
Roberto Busa (1913–2011) – Jesuit, wrote a lemmatization of the complete works of St. Thomas Aquinas (Index Thomisticus) which was later digitalized by IBM

C
Niccolò Cabeo (1586–1650) – Jesuit mathematician; the crater Cabeus is named in his honor
Nicholas Callan (1799–1846) – priest and Irish scientist best known for his work on the induction coil
John Cantius (1390–1473) – priest and Buridanist mathematical physicist who further developed the theory of impetus
Jean Baptiste Carnoy (1836–1899) – priest, has been called the founder of the science of cytology[16]
Giovanni di Casali (died c. 1375) – Franciscan friar who provided a graphical analysis of the motion of accelerated bodies
Paolo Casati (1617–1707) – Jesuit mathematician who wrote on astronomy, meteorology, and vacuums; the crater Casatus on the Moon is named after him; published Terra machinis mota (1658), a dialogue between Galileo, Paul Guldin and father Marin Mersenne on cosmology, geography, astronomy and geodesy, giving a positive image of Galileo 25 years after his conviction.
Laurent Cassegrain (1629–1693) – priest who was the probable namesake of the Cassegrain telescope; the crater Cassegrain on the Moon is named after him
Louis Bertrand Castel (1688-1757) – French Jesuit physicist who worked on gravity and optics in a Cartesian context
Benedetto Castelli (1578–1643) – Benedictine mathematician; long-time friend and supporter of Galileo Galilei, who was his teacher; wrote an important work on fluids in motion
Bonaventura Cavalieri (1598–1647) – Jesuate (not to be confused with Jesuit) known for his work on the problems of optics and motion, work on the precursors of infinitesimal calculus, and the introduction of logarithms to Italy; his principle in geometry partially anticipated integral calculus; the lunar crater Cavalerius is named in his honor
Antonio José Cavanilles (1745–1804) – priest and leading Spanish taxonomic botanist of the 18th century
Francesco Cetti (1726–1778) – Jesuit zoologist and mathematician
Tommaso Ceva (1648–1737) – Jesuit mathematician, poet, and professor who wrote treatises on geometry, gravity, and arithmetic
Christopher Clavius (1538–1612) – German mathematician and astronomer, most noted in connection with the Gregorian calendar, his arithmetic books were used by many mathematicians including Leibniz and Descartes
Guy Consolmagno (1952–) – Jesuit astronomer and planetary scientist, serving as Director of the Vatican Observatory
Nicolaus Copernicus (1473–1543) – Renaissance astronomer and canon famous for his heliocentric cosmology that set in motion the Copernican Revolution
Vincenzo Coronelli (1650–1718) – Franciscan cosmographer, cartographer, encyclopedist, and globe-maker
Bonaventura Corti (1729-1813) – Italian biologist and physicist who made microscopic observations on Tremels, Rotifers and seaweeds
George Coyne (1933–) – Jesuit astronomer and former director of the Vatican Observatory whose research interests have been in polarimetric studies of various subjects, including Seyfert galaxies
James Cullen (mathematician) (1867–1933) – Jesuit mathematician who published what is now known as Cullen numbers in number theory
James Curley (astronomer) (1796–1889) – Jesuit, first director of Georgetown Observatory and determined the latitude and longitude of Washington, D.C.
Albert Curtz (1600–1671) – Jesuit astronomer who expanded on the works of Tycho Brahe and contributed to early understanding of the moon; the crater Curtius on the Moon is named after him
Johann Baptist Cysat (1587–1657) – Jesuit mathematician and astronomer, after whom the lunar crater Cysatus is named; published the first printed European book concerning Japan; one of the first to make use of the newly developed telescope; did important research on comets and the Orion nebula
Jean-Baptiste Chappe d’Auteroche (1722–1769) – priest and astronomer best known for his observations of the transits of Venus
D
Ignazio Danti (1536–1586) – Dominican mathematician, astronomer, cosmographer, and cartographer
Armand David (1826–1900) – Lazarist priest, zoologist, and botanist who did important work in these fields in China
Francesco Denza (1834–1894) – Barnabite meteorologist, astronomer, and director of Vatican Observatory
Václav Prokop Diviš (1698–1765) – Czech priest who studied electrical phenomenons and constructed, among other inventions, the first electrified musical instrument in history
Alberto Dou Mas de Xaxàs (1915–2009) – Spanish Jesuit priest who was president of the Royal Society of Mathematics, member of the Royal Academy of Natural, Physical, and Exact Sciences, and one of the foremost mathematicians of his country
Johann Dzierzon (1811–1906) – priest and pioneering apiarist who discovered the phenomenon of parthenogenesis among bees, and designed the first successful movable-frame beehive; has been described as the “father of modern apiculture”
F
Francesco Faà di Bruno (c. 1825–1888) – priest and mathematician beatified by Pope John Paul II
Honoré Fabri (1607–1688) – Jesuit mathematician and physicist
Jean-Charles de la Faille (1597–1652) – Jesuit mathematician who determined the center of gravity of the sector of a circle for the first time
Gabriele Falloppio (1523–1562) – Canon and one of the most important anatomists and physicians of the sixteenth century; the Fallopian tubes, which extend from the uterus to the ovaries, are named for him
Gyula Fényi (1845–1927) – Jesuit astronomer and director of the Haynald Observatory; noted for his observations of the sun; the crater Fényi on the Moon is named after him
Louis Feuillée (1660–1732) – Minim explorer, astronomer, geographer, and botanist
Kevin T. FitzGerald (1955-) – American molecular biologist and holds the Dr. David Lauler chair in Catholic Health Care Ethics at Georgetown University
Placidus Fixlmillner (1721–1791) – Benedictine priest and one of the first astronomers to compute the orbit of Uranus
Paolo Frisi (1728–1784) – priest, mathematician, and astronomer who did significant work in hydraulics
José Gabriel Funes (1963– ) – Jesuit astronomer and former director of the Vatican Observatory
Lorenzo Fazzini (1787–1837) – priest and physicist born in Vieste and worked in Naples, Italy

G
Joseph Galien (1699 – c. 1762) – Dominican professor who wrote on aeronautics, hailstorms, and airships
Jean Gallois (1632–1707) – French scholar, abbot, and member of Académie des Sciences
Pierre Gassendi (1592–1655) – French priest, astronomer, and mathematician who published the first data on the transit of Mercury; best known intellectual project attempted to reconcile Epicurean atomism with Christianity
Antoine Gaubil (1689-1759) – French astronomer who was the director general of the College of Interpreters at the court of China between 1741 and 1759 and centralized information provided by the Jesuit observatories throughout the world
Agostino Gemelli (1878–1959) – Franciscan physician and psychologist; founded Catholic University of the Sacred Heart in Milan
Johannes von Gmunden (c. 1380–1442) – Canon, mathematician, and astronomer who compiled astronomical tables; Asteroid 15955 Johannesgmunden named in his honor
Carlos de Sigüenza y Góngora (1645–1700) – priest, polymath, mathematician, astronomer, and cartographer; drew the first map of all of New Spain
Andrew Gordon (1712–1751) – Benedictine monk, physicist, and inventor who made the first electric motor
Christoph Grienberger (1561–1636) – Jesuit astronomer after whom the crater Gruemberger on the Moon is named; verified Galileo’s discovery of Jupiter’s moons.
Francesco Maria Grimaldi (1618–1663) – Jesuit who discovered the diffraction of light (indeed coined the term “diffraction”), investigated the free fall of objects, and built and used instruments to measure geological features on the moon
Robert Grosseteste (c. 1175 – 1253) – bishop who was one of the most knowledgeable men of the Middle Ages; has been called “the first man ever to write down a complete set of steps for performing a scientific experiment”[17]
Paul Guldin (1577–1643) – Jesuit mathematician and astronomer who discovered the Guldinus theorem to determine the surface and the volume of a solid of revolution
Bartolomeu de Gusmão (1685–1724) – Jesuit known for his early work on lighter-than-air airship design
H
Johann Georg Hagen (1847–1930) – Jesuit director of the Georgetown and Vatican Observatories; the crater Hagen on the Moon is named after him
Frank Haig (1928-) – American physics professor
Nicholas Halma (1755–1828) – French abbot, mathematician, and translator
Jean-Baptiste du Hamel (1624–1706) – French priest, natural philosopher, and secretary of the Academie Royale des Sciences
René Just Haüy (1743–1822) – priest known as the father of crystallography
Maximilian Hell (1720–1792) – Jesuit astronomer and director of the Vienna Observatory who wrote astronomy tables and observed the Transit of Venus; the crater Hell on the Moon is named after him
Michał Heller (1936– ) – Polish priest, Templeton Prize winner, and prolific writer on numerous scientific topics
Lorenz Hengler (1806–1858) – priest often credited as the inventor of the horizontal pendulum
Hermann of Reichenau (1013–1054) – Benedictine historian, music theorist, astronomer, and mathematician
Pierre Marie Heude (1836–1902) – Jesuit missionary and zoologist who studied the natural history of Eastern Asia
Franz von Paula Hladnik (1773–1844) – priest and botanist who discovered several new kinds of plants, and certain genera have been named after him
Giovanni Battista Hodierna (1597–1660) – priest and astronomer who catalogued nebulous objects and developed an early microscope
Johann Baptiste Horvath (1732-1799) – Hungarian physicist who taught physics and philosophy at the University of Tyrnau, later of Buda, and wrote many Newtonian textbooks
Victor-Alphonse Huard (1853–1929) – priest, naturalist, educator, writer, and promoter of the natural sciences
I
Maximus von Imhof (1758–1817) – German Augustinian physicist and director of the Munich Academy of Sciences
Giovanni Inghirami (1779–1851) – Italian Piarist astronomer who has a valley on the moon named after him as well as a crater
J
François Jacquier (1711–1788) – Franciscan mathematician and physicist; at his death he was connected with nearly all the great scientific and literary societies of Europe
Stanley Jaki (1924–2009) – Benedictine priest and prolific writer who wrote on the relationship between science and theology
Ányos Jedlik (1800–1895) – Benedictine engineer, physicist, and inventor; considered by Hungarians and Slovaks to be the unsung father of the dynamo and electric motor

K
Georg Joseph Kamel (1661–1706) – Jesuit missionary and botanist who established the first pharmacy in the Philippines; the genus Camellia is named for him
Karl Kehrle (1898–1996) – Benedictine Monk of Buckfast Abbey, England; beekeeper; world authority on bee breeding, developer of the Buckfast bee
Eusebio Kino (1645–1711) – Jesuit missionary, mathematician, astronomer and cartographer; drew maps based on his explorations first showing that California was not an island, as then believed; published an astronomical treatise in Mexico City of his observations of the Kirsch comet
Otto Kippes (1905–1994) – priest acknowledged for his work in asteroid orbit calculations; the main belt asteroid 1780 Kippes was named in his honour
Athanasius Kircher (1602–1680) – Jesuit who has been called the father of Egyptology and “Master of a hundred arts”; wrote an encyclopedia of China; one of the first people to observe microbes through a microscope; in his Scrutinium Pestis of 1658 he noted the presence of “little worms” or “animalcules” in the blood, and concluded that the disease was caused by micro-organisms; this is antecedent to germ theory
Wenceslas Pantaleon Kirwitzer (1588–1626) – Jesuit astronomer and missionary to China who published observations of comets
Jan Krzysztof Kluk (1739–1796) – priest, naturalist agronomist, and entomologist who wrote a multi-volume work on Polish animal life
Marian Wolfgang Koller (1792–1866) – Benedictine professor who wrote on astronomy, physics, and meteorology
Franz Xaver Kugler (1862–1929) – Jesuit chemist, mathematician, and Assyriologist who is most noted for his studies of cuneiform tablets and Babylonian astronomy
L
Ramon Llull (ca. 1232 – ca. 1315) – Majorcan writer and philosopher, logician and a Franciscan tertiary considered a pioneer of computation theory
Nicolas Louis de Lacaille (1713–1762) – French deacon and astronomer noted for cataloguing stars, nebulous objects, and constellations
Eugene Lafont (1837–1908) – Jesuit physicist, astronomer, and founder of the first Scientific Society in India
Antoine de Laloubère (1600–1664) – Jesuit and first mathematician to study the properties of the helix
Bernard Lamy (1640–1715) – Oratorian philosopher and mathematician who wrote on the parallelogram of forces
Roberto Landell de Moura (1861–1928) – priest and inventor who was the first to accomplish the transmission of the human voice by a wireless machine
Pierre André Latreille (1762–1833) – priest and entomologist whose works describing insects assigned many of the insect taxa still in use today
Georges Lemaître (1894–1966) – Belgian priest and father of the Big Bang theory
Émile Licent (1876–1952) – French Jesuit trained as a natural historian; spent more than 25 years researching in Tianjin, China
Joseph Xaver Liesganig (1719-1799) – Austrian astronomer and geodesist who managed the Jesuit observatory in Vienna between 1756 and 1773
Thomas Linacre (c. 1460–1524) – English priest, humanist, translator, and physician
Francis Line (1595–1675) – Jesuit magnetic clock and sundial maker who disagreed with some of the findings of Newton and Boyle
Juan Caramuel y Lobkowitz (1606–1682) – Cistercian who wrote on a variety of scientific subjects, including probability theory
João de Loureiro (1717–1791) – Portuguese mathematician and botanist active in Cochinchina

M
Jean Mabillon (1632–1707) – Benedictine monk and scholar, considered the founder of palaeography and diplomatics
James B. Macelwane (1883–1956) – Jesuit seismologist who contributed a volume to the first textbook on seismology in America
John MacEnery (1797–1841) – archaeologist who investigated the Palaeolithic remains at Kents Cavern
Manuel Magri (1851–1907) – Jesuit ethnographer, archaeologist and writer; one of Malta’s pioneers in archaeology
Emmanuel Maignan (1601–1676) – Minim physicist and professor of medicine who published works on gnomonics and perspective
Pal Mako (1724-1793) – Hungarian mathematician and physicist who taught mathematics, experimental physics and mechanics at the Vienna Theresianum and had a part in the preparation of the Ratio educationis (1777), which reformed the imperial teaching system in the spirit of Enlightenment
Charles Malapert (1581–1630) – Jesuit writer, astronomer, and proponent of Aristotelian cosmology; also known for observations of sunpots, the lunar surface, and the southern sky; the crater Malapert on the Moon is named after him
Nicolas Malebranche (1638–1715) – Oratorian philosopher who studied physics, optics, and the laws of motion and disseminated the ideas of Descartes and Leibniz
Marcin of Urzędów (c. 1500–1573) – priest, physician, pharmacist, and botanist
Joseph Maréchal (1878–1944) – Jesuit philosopher and psychologist
Marie-Victorin (1885–1944) – Christian Brother and botanist best known as the father of the Jardin botanique de Montréal
Edme Mariotte (c. 1620–1684) – priest and physicist who recognized Boyle’s Law and wrote about the nature of color
Francesco Maurolico (1494–1575) – Benedictine who made contributions to the fields of geometry, optics, conics, mechanics, music, and astronomy, and gave the first known proof by mathematical induction
Christian Mayer (astronomer) (1719–1783) – Jesuit astronomer most noted for pioneering the study of binary stars
James Robert McConnell (1915–1999) – Irish theoretical physicist, pontifical academician, Monsignor
Michael C. McFarland (1948-) – American computer scientist and president of the College of the Holy Cross in Worcester, Massachusetts
Paul McNally (1890–1955) – Jesuit astronomer and director of Georgetown Observatory; the crater McNally on the Moon is named after him
Gregor Mendel (1822–1884) – Augustinian monk and father of genetics
Pietro Mengoli (1626–1686) – priest and mathematician who first posed the famous Basel Problem
Giuseppe Mercalli (1850–1914) – priest, volcanologist, and director of the Vesuvius Observatory who is best remembered today for his Mercalli scale for measuring earthquakes which is still in use
Marin Mersenne (1588–1648) – Minim philosopher, mathematician, and music theorist, so-called “father of acoustics”
Paul of Middelburg (1446–1534) – Bishop who wrote on the reform of the calendar
Maciej Miechowita (1457–1523) – Canon who wrote the first accurate geographical and ethnographical description of Eastern Europe, as well as two medical treatises
François-Napoléon-Marie Moigno (1804–1884) – Jesuit physicist and mathematician; was an expositor of science and translator rather than an original investigator
Juan Ignacio Molina (1740–1829) – Jesuit naturalist, historian, botanist, ornithologist and geographer
Louis Moréri (1643–1680) – 17th-century priest and encyclopaedist
Theodorus Moretus (1602–1667) – Jesuit mathematician and author of the first mathematical dissertations ever defended in Prague; the lunar crater Moretus is named after him
Gabriel Mouton (1618–1694) – abbot, mathematician, astronomer, and early proponent of the metric system
Jozef Murgaš (1864–1929) – priest who contributed to wireless telegraphy and helped develop mobile communications and wireless transmission of information and human voice
José Celestino Mutis (1732–1808) – Canon, botanist, and mathematician who led the Royal Botanical Expedition of the New World
N
Bienvenido Nebres (1940-) – Filipino mathematician, president of Ateneo de Manila University, and an honoree of the National Scientist of the Philippines award
Jean François Niceron (1613–1646) – Minim mathematician who studied geometrical optics
Nicholas of Cusa (1401–1464) – Cardinal, philosopher, jurist, mathematician, astronomer, and one of the great geniuses and polymaths of the 15th century
Julius Nieuwland (1878–1936) – Holy Cross priest, known for his contributions to acetylene research and its use as the basis for one type of synthetic rubber, which eventually led to the invention of neoprene by DuPont
Jean-Antoine Nollet (1700–1770) – abbot and physicist who discovered the phenomenon of osmosis in natural membranes

O
Hugo Obermaier (1877–1946) – priest, prehistorian, and anthropologist who is known for his work on the diffusion of mankind in Europe during the Ice Age, as well as his work with north Spanish cave art
William of Ockham (c. 1288 – c. 1348) – Franciscan Scholastic who wrote significant works on logic, physics, and theology; known for Occam’s razor-principle
Nicole Oresme (c. 1323–1382) – one of the most famous and influential philosophers of the later Middle Ages; economist, mathematician, physicist, astronomer, philosopher, theologian and Bishop of Lisieux, and competent translator; one of the most original thinkers of the 14th century
Barnaba Oriani (1752–1832) – Barnabite geodesist, astronomer and scientist whose greatest achievement was his detailed research of the planet Uranus; also known for Oriani’s theorem
P
Tadeusz Pacholczyk (1965–) – priest, neuroscientist and writer
Luca Pacioli (c. 1446–1517) – Franciscan friar who published several works on mathematics; often regarded as the “father of accounting”
Ignace-Gaston Pardies (1636–1673) – Jesuit physicist known for his correspondence with Newton and Descartes
Franciscus Patricius (1529–1597) – priest, cosmic theorist, philosopher, and Renaissance scholar
John Peckham (1230–1292) – Archbishop of Canterbury and early practitioner of experimental science
Nicolas Claude Fabri de Peiresc (1580–1637) – abbot and astromer who discovered the Orion Nebula; lunar crater Peirescius named in his honor
Stephen Joseph Perry (1833–1889) – Jesuit astronomer and Fellow of the Royal Society; made frequent observations of Jupiter’s satellites, of stellar occultations, of comets, of meteorites, of sun spots, and faculae
Giambattista Pianciani (1784–1862) – Jesuit mathematician and physicist who established the electric nature of aurora borealis
Giuseppe Piazzi (1746–1826) – Theatine mathematician and astronomer who discovered Ceres, today known as the largest member of the asteroid belt; also did important work cataloguing stars
Jean Picard (1620–1682) – priest and first person to measure the size of the Earth to a reasonable degree of accuracy; also developed what became the standard method for measuring the right ascension of a celestial object; the PICARD mission, an orbiting solar observatory, is named in his honor
Edward Pigot (1858–1929) – Jesuit seismologist and astronomer
Alexandre Guy Pingré (1711–1796) – French priest astronomer and naval geographer; the crater Pingré on the Moon is named after him, as is the asteroid 12719 Pingré
Andrew Pinsent (1966–) – priest whose current research includes the application of insights from autism and social cognition to ‘second-person’ accounts of moral perception and character formation; his previous scientific research contributed to the DELPHI experiment at CERN
Jean Baptiste François Pitra (1812–1889) – Benedictine cardinal, archaeologist and theologian who noteworthy for his great archaeological discoveries
Charles Plumier (1646–1704) – Minim friar who is considered one of the most important botanical explorers of his time
Marcin Odlanicki Poczobutt (1728–1810) – Jesuit astronomer and mathematician; granted the title of the King’s Astronomer; the crater Poczobutt on the Moon is named after him; taught astronomy at Vilna University (1764-1808), managed its observatory and was the rector of Vilna University between 1777 and 1808
Léon Abel Provancher (1820–1892) – priest and naturalist devoted to the study and description of the fauna and flora of Canada; his pioneer work won for him the appellation of the “father of natural history in Canada”

Astronomer Georges Lemaitre (right) speaks with Albert Einstein after a talk in Pasadena, Calif., in 1932. Lemaitre first published a paper on the expansion of the universe in 1927, but it ran in a minor French scientific journal. The study was republished in 1931, but with key sections missing; a recently found letter indicates it was Lemaitre himself who made the edits.

R
Claude Rabuel (1669–1729) – Jesuit mathematician who analyzed Descartes’s Géométrie
Louis Receveur (1757–1788) – Franciscan naturalist and astronomer; described as being as close as one could get to being an ecologist in the 18th century
Franz Reinzer (1661–1708) – Jesuit who wrote an in-depth meteorological, astrological, and political compendium covering topics such as comets, meteors, lightning, winds, fossils, metals, bodies of water, and subterranean treasures and secrets of the earth
Louis Rendu (1789–1859) – bishop who wrote an important book on the mechanisms of glacial motion; the Rendu Glacier, Alaska, US and Mount Rendu, Antarctica are named for him
Vincenzo Riccati (1707–1775) – Italian Jesuit mathematician and physicist
Matteo Ricci (1552–1610) – one of the founding fathers of the Jesuit China Mission and co-author of the first European-Chinese dictionary
Giovanni Battista Riccioli (1598–1671) – Jesuit astronomer who authored Almagestum novum, an influential encyclopedia of astronomy; the first person to measure the rate of acceleration of a freely falling body; created a selenograph with Father Grimaldi that now adorns the entrance at the National Air and Space Museum in Washington, D.C.; first to note that Mizar was a “double star”
Richard of Wallingford (1292–1336) – abbot, renowned clockmaker, and one of the initiators of western trigonometry
Lluis Rodés (1881-1939) – Spanish astronomer and director of Observatorio del Ebro, wrote El Frmamento
Johannes Ruysch (c. 1460–1533) – priest, explorer, cartographer, and astronomer who created the second oldest known printed representation of the New World
S
Giovanni Girolamo Saccheri (1667–1733) – Jesuit mathematician and geometer who was perhaps the first European to write about Non-Euclidean geometry
Johannes de Sacrobosco (c. 1195 – c. 1256) – Irish monk and astronomer who wrote the authoritative medieval astronomy text Tractatus de Sphaera; his Algorismus was the first text to introduce Hindu-Arabic numerals and procedures into the European university curriculum; the lunar crater Sacrobosco is named after him
Gregoire de Saint-Vincent (1584–1667) – Jesuit mathematician who made important contributions to the study of the hyperbola
Alphonse Antonio de Sarasa (1618–1667) – Jesuit mathematician who contributed to the understanding of logarithms
Christoph Scheiner (c. 1573–1650) – Jesuit physicist, astronomer, and inventor of the pantograph; wrote on a wide range of scientific subjects, including sunspots, leading to a dispute with Galileo Galilei
Wilhelm Schmidt (linguist) (1868–1954) – Austrian priest, linguist, anthropologist, and ethnologist
George Schoener (1864–1941) – priest who became known in the United States as the “Padre of the Roses” for his experiments in rose breeding
Gaspar Schott (1608–1666) – Jesuit physicist, astronomer, and natural philosopher who is most widely known for his works on hydraulic and mechanical instruments
Franz Paula von Schrank (1747–1835) – priest, botanist, entomologist, and prolific writer
Berthold Schwarz (c. 14th century) – Franciscan friar and reputed inventor of gunpowder and firearms
Anton Maria Schyrleus of Rheita (1604–1660) – Capuchin astronomer and optician who built Kepler’s telescope
George Mary Searle (1839–1918) – Paulist astronomer and professor who discovered six galaxies
Angelo Secchi (1818–1878) – Jesuit pioneer in astronomical spectroscopy and one of the first scientists to state authoritatively that the sun is a star; discovered the existence of solar spicules and drew an early map of Mars
Alessandro Serpieri (1823–1885) – priest, astronomer, and seismologist who studied shooting stars, and was the first to introduce the concept of the seismic radiant
Gerolamo Sersale (1584–1654) – Jesuit astronomer and selenographer; his map of the moon can be seen in the Naval Observatory of San Fernando; the lunar crater Sirsalis is named after him
Benedict Sestini (1816–1890) – Jesuit astronomer, mathematician and architect; studied sunspots and eclipses; wrote textbooks on a variety of mathematical subjects
René François Walter de Sluse (1622–1685) – Canon and mathematician with a family of curves named after him
Domingo de Soto (1494–1560) – Spanish Dominican priest and professor at the University of Salamanca; in his commentaries to Aristotle he proposed that free falling bodies undergo constant acceleration
Lazzaro Spallanzani (1729–1799) – priest, biologist, and physiologist who made important contributions to the experimental study of bodily functions, animal reproduction, and essentially discovered echolocation; his research of biogenesis paved the way for the investigations of Louis Pasteur
Valentin Stansel (1621–1705) – Jesuit astronomer in Brazil, who discovered a comet, which, after accurate positions were made via F. de Gottignies in Goa, became known as the Estancel-Gottignies comet
Johan Stein (1871–1951) – Jesuit astronomer and director of the Vatican Observatory, which he modernized and relocated to Castel Gandolfo; the crater Stein on the far side of the Moon is named after him
Nicolas Steno (1638–1686) – Bishop beatified by Pope John Paul II who is often called the father of geology[18] and stratigraphy,[8] and is known for Steno’s principles
Joseph Stepling (1716-1778) – Bohemian astronomer, physicist and mathematician who managed the Jesuit observatory in Prague between 1751 and 1778
Pope Sylvester II (c. 946–1003) – Prolific scholar who endorsed and promoted Arabic knowledge of arithmetic, mathematics, and astronomy in Europe, reintroducing the abacus and armillary sphere which had been lost to Europe since the end of the Greco-Roman era
Alexius Sylvius Polonus (1593 – c. 1653) – Jesuit astronomer who studied sunspots and published a work on calendariography
Ignacije Szentmartony (1718–1793) – Jesuit cartographer and royal mathematician and astronomer, who became a member of the expedition that worked on the rearrangement of the frontiers among colonies in South America, especially Brazil

T
André Tacquet (1612–1660) – Jesuit mathematician whose work laid the groundwork for the eventual discovery of calculus
Pierre Teilhard de Chardin (1881–1955) – Jesuit paleontologist and geologist who took part in the discovery of Peking Man
Francesco Lana de Terzi (c. 1631–1687) – Jesuit referred to as the Father of Aviation[19] for his pioneering efforts; he also developed a blind writing alphabet prior to Braille.
Theodoric of Freiberg (c. 1250 – c. 1310) – Dominican theologian and physicist who gave the first correct geometrical analysis of the rainbow
Joseph Tiefenthaler (1710–1785) – Jesuit who was one of the earliest European geographers to write about India
Giuseppe Toaldo (1719–1797) – priest and physicist who studied atmospheric electricity and did important work with lightning rods; the asteroid 23685 Toaldo is named for him
José Torrubia (c. 1700–1768) – Franciscan linguist, scientist, collector of fossils and books, and writer on historical, political and religious subjects
Franz de Paula Triesnecker (1745–1817) – Jesuit astronomer and director of the Vienna Observatory; published a number of treatises on astronomy and geography; the crater Triesnecker on the Moon is named after him
V
Luca Valerio (1552–1618) – Jesuit mathematician who developed ways to find volumes and centers of gravity of solid bodies
Pierre Varignon (1654–1722) – priest and mathematician whose principle contributions were to statics and mechanics; created a mechanical explanation of gravitation
Jacques de Vaucanson (1709–1782) – French Minim friar inventor and artist who was responsible for the creation of impressive and innovative automata and machines such as the first completely automated loom
Giovanni Battista Venturi (1746–1822) – priest who discovered the Venturi effect
Fausto Veranzio (c. 1551–1617) – Bishop, polymath, inventor, and lexicographer
Ferdinand Verbiest (1623–1688) – Jesuit astronomer and mathematician; designed what some claim to be the first ever self-propelled vehicle, which many claim this as the world’s first automobile
Francesco de Vico (1805–1848) – Jesuit astronomer who discovered or co-discovered a number of comets; also made observations of Saturn and the gaps in its rings; the lunar crater De Vico and the asteroid 20103 de Vico are named after him
Vincent of Beauvais (c.1190–c.1264) – Dominican who wrote the most influential encyclopedia of the Middle Ages
Benito Vines (1837–1893) – Jesuit meteorologist known as “Father Hurricane” who made the first weather model to predict the trajectory of a hurricane[20][21][dead link][22]
János Vitéz (archbishop) (c.1405–1472) – Cardinal Archbishop of Esztergom, astronomer, and mathematician
Giovanni Serafino Volta (1764-1842) – Priest and paleontologist who wrote the first treatise on fossil ichthyology in Italy
W
Martin Waldseemüller (c. 1470–1520) – German priest and cartographer who, along with Matthias Ringmann, is credited with the first recorded usage of the word America
Erich Wasmann (1859–1931) – Austrian entomologist known for Wasmannian mimicry
Godefroy Wendelin (1580–1667) – priest and astronomer who recognized that Kepler’s third law applied to the satellites of Jupiter; the lunar crater Vendelinus is named in his honor
Johannes Werner (1468–1522) – priest, mathematician, astronomer, and geographer
Witelo (c. 1230 – after 1280, before 1314) – Friar, physicist, natural philosopher, and mathematician; lunar crater Vitello named in his honor; his Perspectiva powerfully influenced later scientists, in particular Johannes Kepler
Julian Tenison Woods (1832–1889) – Passionist geologist and mineralogist
Theodor Wulf (1868–1946) – Jesuit physicist who was one of the first experimenters to detect excess atmospheric radiation
Franz Xaver von Wulfen (1728–1805) – Jesuit botanist, mineralogist, and alpinist
X
Leonardo Ximenes (1711-1786) – Italian physicist and astronomer, specialist of hydraulics, creator and director of the Observatory San Giovanino in Florence
Z
John Zahm (1851–1921) – Holy Cross priest and South American explorer
Giuseppe Zamboni (1776–1846) – priest and physicist who invented the Zamboni pile, an early electric battery similar to the Voltaic pile
Francesco Zantedeschi (1797–1873) – priest who was among the first to recognize the marked absorption by the atmosphere of red, yellow, and green light; published papers on the production of electric currents in closed circuits by the approach and withdrawal of a magnet, thereby anticipating Michael Faraday’s classical experiments of 1831[23]
Niccolò Zucchi (1586–1670) – claimed to have tried to build a reflecting telescope in 1616 but abandoned the idea (maybe due to the poor quality of the mirror);[24] may have been the first to see the belts on the planet Jupiter (1630)[25]
Giovanni Battista Zupi (c. 1590–1650) – Jesuit astronomer, mathematician, and first person to discover that the planet Mercury had orbital phases; the crater Zupus on the Moon is named after him

Summa Catechetica, "Neque enim quaero intelligere ut credam, sed credo ut intelligam." – St Anselm, "Let your religion be less of a theory, and more of a love affair." -G.K. Chesterton, "I want a laity, not arrogant, not rash in speech, not disputatious, but men and women who know their religion, who enter into it, who know just where they stand, who know what they hold and what they do not, and who know their creed so well that they can give an account of it."- Bl John Henry Newman, Cong. Orat., "Encounter, not confrontation; attraction, not promotion; dialogue, not debate." -cf Pope Francis, “You will not see anyone who is really striving after his advancement who is not given to spiritual reading. And as to him who neglects it, the fact will soon be observed by his progress.” -St Athanasius, "To convert someone, go and take them by the hand and guide them." -St Thomas Aquinas, OP. 1 saint ruins ALL the cynicism in Hell & on Earth. “When we pray we talk to God; when we read God talks to us…All spiritual growth comes from reading and reflection.” -St Isidore of Seville, “Also in some meditations today I earnestly asked our Lord to watch over my compositions that they might do me no harm through the enmity or imprudence of any man or my own; that He would have them as His own and employ or not employ them as He should see fit. And this I believe is heard.” -GM Hopkins, SJ, "Only God knows the good that can come about by reading one good Catholic book." — St. John Bosco, "Why don't you try explaining it to them?" – cf St Peter Canisius, SJ, Doctor of the Church, Doctor of the Catechism, "Already I was coming to appreciate that often apologetics consists of offering theological eye glasses of varying prescriptions to an inquirer. Only one prescription will give him clear sight; all the others will give him at best indistinct sight. What you want him to see—some particular truth of the Faith—will remain fuzzy to him until you come across theological eye glasses that precisely compensate for his particular defect of vision." -Karl Keating, "The more perfectly we know God, the more perfectly we love Him." -St Thomas Aquinas, OP, ST, I-II,67,6 ad 3, “But always when I was without a book, my soul would at once become disturbed, and my thoughts wandered." —St. Teresa of Avila, "Let those who think I have said too little and those who think I have said too much, forgive me; and let those who think I have said just enough thank God with me." –St. Augustine