The Thomistic Institute

Prof. Michael Dauphinais explains what contemporary culture needs to learn from Thomas Aquinas, arguing for a metaphysics of communion in which God, family, Church, and society are not locked in competition but share common goods that make each more fully alive.

This lecture was given on September 22nd, 2025, at University of Florida.

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Michael A. Dauphinais, Ph.D., serves as the Fr. Matthew Lamb Professor of Catholic Theology and the co-director of the Aquinas Center for Theological Renewal at Ave Maria University, Ave Maria, Florida. He has co-authored with Matthew Levering Knowing the Love of Christ: An Introduction to the Theology of Thomas Aquinas; Holy People, Holy Land: A Theological Introduction to the Bible; and The Wisdom of the Word: Biblical Answers to Ten Questions about Catholicism. He specializes in C.S. Lewis, the Bible, and St. Thomas Aquinas. He speaks frequently in both academic and popular settings, and particularly enjoys visiting Thomistic Institute student chapters. Dr. Dauphinais hosts The Catholic Theology Show podcast to help a wide audience discover the richness of coming to know and love God as he has revealed himself in Jesus Christ.

Keywords: Common Good, Common Good versus Zero-Sum Competition, God’s Non-Competitive Action, Human Community, Metaphysics of Communion, Natural Law, Original Sin and False Image of God, Participated Goods in Family and Society, Thomistic View of Marriage and Family, Vision of God in Evangelium Vitae

Fr. Alan O’Sullivan unpacks Aquinas on the good life, explaining why wealth, power, fame, and pleasure cannot be our ultimate happiness and how true beatitude is found in virtuous activity ordered to God.

This lecture was given on October 23rd, 2025, at Trinity College Dublin.

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Fr. Alan O’Sullivan, O.P. (Trinity College) is currently the chaplain of Trinity College, Dublin. He is a member of the Irish province of the Order of Preachers who studied at Blackfriars, Oxford.

Keywords: Aquinas on the Good Life, Beatitude and True Happiness, Epicureanism, Limits of Wealth Power and Fame, Pleasure and the Highest Good, Restlessness and Desire for More, Virtue and Ordered Pleasure, Worldly Goods, Ultimate Happiness

Fr. Irenaeus Dunlevy introduces Aquinas’ Five Ways, showing how arguments from motion, causality, contingency, gradation, and teleology lead from everyday experience to the rational conclusion that God exists as first mover, first cause, necessary being, supreme perfection, and intelligent governor.

This lecture was given on May 8th, 2025, at North Dakota State University.

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Fr. Irenaeus Dunlevy, O.P. is a Coordinator for Campus Outreach at the Thomistic Institute in Washington, DC. He has served as a parochial vicar at St. Pius V Church in Providence, RI, as well as an adjunct professor and assistant chaplain at Providence College. He originates from Columbus, OH, studied architecture in Virginia and Switzerland, and practiced in the DC area before entering the Order of Preachers in 2013. He was ordained a priest in 2020 at the Dominican House of Studies during the quarantine. In his work with the Thomistic Institute, he has given talks on the virtue of penance, loving God with the mind, and the intersection of theology and architecture. He often travels the country visiting Thomistic Institute Campus Chapters, leading seminars that help students grasp Thomistic concepts. Additionally, he coordinates the TI's intellectual retreat programming, which affords students time to pray and integrate into their lives Thomistic theology and philosophy.

Keywords: Act and Potency, Argument from Motion, Contingency and Necessary Being, Degrees of Perfection and Maximum Good, Five Ways to Prove God’s Existence, First Cause and Efficient Causality, Teleology and Intelligent Governor, Thomistic Proofs for God, Unmoved Mover

Prof. Christopher Tollefsen explains John Paul II on euthanasia, showing how the Pope’s vision of human life as a sacred gift, bearing God’s image and destined for eternal friendship with Him, rules out any claim to a right to kill oneself or others.

This lecture was given on September 23rd, 2025, at University of South Carolina.

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Christopher Tollefsen is Professor of Philosophy at the University of South Carolina. He has published over 100 articles in journals and edited collections, and a similar number of popular essays in venues such as Public Discourse, First Things, and National Review. He is the author of Lying and Christian Ethics and the forthcoming Killing and Christian Ethics, and is co-author of The Way of Medicine: Ethics and the Healing Profession (with Dr. Farr Curlin) and Embryo: A Defense of Human Life (with Robert P. George). In 2019-20, he served as a Commissioner on the State Department’s Commission on Unalienable Rights. He has twice been a Visiting Fellow in the James Madison Program at Princeton University, and in 2024-25 was a Visiting Fellow at the DeNicola Center for Ethics and Culture at the University of Notre Dame.

Keywords: Euthanasia, Evangelium Vitae, Gift of Life, Human Destiny, Human Dignity, Imago Dei, Inviolability of Human Life, John Paul II, Life and Death, Lordship of God over Life, Sacredness of Human Life, Usurping God’s Role in Life and Death

Fr. Anton ten Klooster explores St. Thomas Aquinas on the Beatitudes, showing how they map an ordered, grace‑filled path of virtues and gifts that lead from imperfect happiness in this life to perfect union with God in the next.

This lecture was given on November 3rd, 2025, at Oxford University.

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Fr. Anton is an assistant professor of theology at Tilburg University. His primary focus is on fundamental moral theology. He is currently working on a book on the development of moral teaching (e.g. How did the church come to oppose slavery, and how can we then hold a continuity in teaching?). He studied theology in Utrecht and Fribourg, and did part of the doctoral research as a visiting scholar at the Catholic University of America in Washington D.C. In 2018, he was awarded the doctoral degree cum laude for 'Thomas Aquinas on the Beatitudes'. The dissertation was awarded the international 'Veritas et Amor' award by the Circolo San Tommaso. He has been published in journals such as Nova et Vetera, Angelicum, Journal of Moral Theology and Incontri.

Keywords: Aquinas on Happiness and Man's Final End, Beatitudes, Beatitudes as Path to Union with God, False Views of Happiness, Grace and the Beatitudes, Gifts of the Spirit, Imperfect versus Perfect Happiness, Virtue and the Beatitudes, Vocation of Preaching