Dr. Edmund Lazzari defends the coherence and relevance of the Trinity by addressing Thomas Jefferson’s objections through Thomistic philosophy, emphasizing divine revelation’s role in understanding God’s triune nature.This lecture was given on March 3rd, 2025, at College of William and Mary.For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.About the Speaker:Edmund Lazzari is Teaching Fellow in the Department of Catholic Studies at Duquesne University. Dr. Lazzari is also a member of the Aquinas and 'the Arabs' International Working Group and affiliated faculty of the Carl G. Grefenstette Center for Ethics in Science, Technology, and Law. A former Basselin Fellow, he earned an ecclesiastical licentiate degree in philosophy from the Catholic University of America, as well as a doctorate in systematic theology and ethics from Marquette University. He has previously taught philosophy and theology at Mount St. Mary's University, Marquette University, the Massachusetts Institute of Technology, and other universities not starting with the letter "M." Dr. Lazzari has published on a wide variety of topics in theology, such as theology and science, the thought of St. Thomas Aquinas, Catholic-Muslim dialogue, liturgical theology, machine learning/AI, Catholic ethics, and extraterrestrial intelligence. He is the author of two books: Why Nature Matters: Unlocking Catholic Doctrine through Commonsense Philosophy (2022) and Miracles in Said Nursi and Thomas Aquinas (Routledge, 2024).This project/publication was made possible through the support of Grant 63391 from the John Templeton Foundation. The opinions expressed in this publication are those of the author(s) and do not necessarily reflect the views of the John Templeton Foundation.Keywords: Arianism, Divine Essence, Divine Revelation, Modalist Heresy, Summa Theologica, Thomistic Philosophy, Transcendent Reality, Trinitarian Persons, Unity-in-Diversity, Worship and Salvation