Your NSTI Courses

Welcome back to the New Saint Thomas Institute (NSTI.com)! As a student member, you have access to all of our courses. Premium and Gold members can earn their certificate in the certificate courses. For example, you can earn your Certificate in Catholic New Testament Studies by completing all units and passing the final exam at the end. (We provide you with a review to help you.) Choose one of the courses below and get started. If you’d like to track your progress, please visit your progress dashboard by clicking here and scroll down a little to see how far you’ve progressed.

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A Complete Journey Through Catholic Theology

From Scripture and the Church Fathers to Apologetics, Philosophy, Mariology and the Apocalypse — every NSTI course is built to draw you closer to Jesus Christ. Learn at your own pace and you will be able to defend the Faith confidently for the rest of your life.

CERTIFICATE COURSE

± 7 HOURS

Catholic Philosophy

Explore the foundations of Catholic thought with Saint Thomas Aquinas as your guide. From the existence of God to the Trinity, creation, and virtue, this course makes the Summa Theologiae accessible to every Catholic.

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CERTIFICATE COURSE

± 9 HOURS

Catholic Theology

Explore salvation, the sacraments, and the Real Presence through the wisdom of Aquinas and Augustine. This course covers Christology, Mariology, and Eucharistic theology, rooted in Scripture and Tradition.

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CERTIFICATE COURSE

± 9 HOURS

Catholic Apologetics

Learn to defend the Faith with confidence and charity. This course equips you to answer objections from atheists, Protestants, and other traditions — covering moral teaching, Church history, and the art of bringing people home.

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CERTIFICATE COURSE

± 6 HOURS

Church Fathers

Trace the first centuries of the Faith from the Apostolic Fathers through the great Councils and Doctors of the Church. This course covers the heresies, martyrs, and theological battles that defined Catholic orthodoxy.

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CERTIFICATE COURSE

± 10 HOURS

Medieval Theology

From the fall of Rome to the eve of the Reformation, this course traces the saints, scholars, and crises that shaped the medieval Church — including Saint Thomas Aquinas, the Crusades, the Black Death, and the great heresies.

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CERTIFICATE COURSE

± 6 HOURS

Reformation & Modern History

From Martin Luther to Vatican II, this course charts the Church’s response to rupture and renewal. Explore the Council of Trent, the great mystics, Our Lady of Guadalupe, and the tumultuous papacies that shaped modern Catholicism.

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CERTIFICATE COURSE

± 10 HOURS

Catholic New Testament

From the four Gospels to Revelation, this course offers a faithful Catholic reading of the entire New Testament. Explore Paul’s epistles, the early Church, and the sacred canon — grounded in Scripture, Tradition, and sound exegesis.

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CERTIFICATE COURSE

± 9 HOURS

Christ in the Old Testament

Discover Jesus on every page of the Old Testament. This course traces the types, prophecies, and prefigurements of Christ from Genesis to Malachi, revealing the entire sacred story as one unified covenant toward salvation.

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CERTIFICATE COURSE

± 9 HOURS

Latin Mass and Roman Rite

Learn to pray in Latin, understand the Traditional Mass, and trace the Roman Rite through two thousand years of history. This course opens the treasury of traditional Catholic worship from the altar to the chant.

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CERTIFICATE COURSE

± 12 HOURS

Apocalyptic Studies

Unlock the symbols, prophecies, and hidden texts of Catholic eschatology. This course moves from the Old Testament prophets through Revelation — and into the private revelations that have captivated the Church for centuries.

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Bonus Courses

We also offer bonus courses designed to enhance your liturgical year. Explore them below.

BONUS COURSE

± 10 HOURS

Mariology

Learn to defend and love Our Lady with confidence. This mini-course covers Marian doctrine, the great apparitions, and the full theology of the Rosary — equipping you to answer objections and pray all four sets of mysteries.

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BONUS COURSE

± 10 HOURS

Angels and Demons

Explore the Catholic theology of angels and spiritual warfare. This mini-course covers the nine choirs, the fall of the angels, demonology, and features Q&A with experienced exorcists on possession, curses, and deliverance.

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BONUS COURSE

± 4.5 HOURS

Lent

Fast, pray, and enter the season with deeper intention. This mini-course traces the history and theology of Lent through the wisdom of Saint Thomas Aquinas and the saints — from Ash Wednesday to the Resurrection.

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NOT SURE WHERE TO START?

Take Your First Step

Not sure where to begin? Catholic Philosophy is the ideal starting point. This certificate course introduces the thought of Saint Thomas Aquinas — the foundation beneath every other course in the NSTI catalog.

Build the intellectual roots of your faith here, and everything else will follow.

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PREMIUM AND GOLD MEMBERS

Earn Your NSTI Certificates

Premium and Gold members can earn their certificate in all full courses offered on NSTI. Upgrade today to enjoy all the perks are included in these memberships.

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