Show Notes
Fr. Gregory Pine, O.P. examines the Catholic teaching on truthfulness as an exercise of justice, defining lying as a sin that perverts the faculty of speech and undermines the common good.
This lecture was given on September 10th, 2026, at The Catholic University of America.
For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events
About the Speaker:
Fr. Gregory Pine, O.P., is an instructor of dogmatic and moral theology at the Dominican House of Studies and the Assistant Director of the Thomistic Institute. He holds a doctorate from the University of Fribourg (Switzerland). He is the author of Prudence: Choose Confidently, Live Boldly and Your Eucharistic Identity: A Sacramental Guide to the Fullness of Life, and is co-author of Credo: An RCIA Program and Marian Consecration with Aquinas.
His writing also appears in Aleteia, Magnificat, and Ascension’s Catholic Classics series. In addition to the TI podcast, he regularly contributes to the podcasts Godsplaining and Pints with Aquinas, and Catholic Classics.
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 speakers and do not necessarily reflect the views of the John Templeton Foundation.
Keywords: Truth, Morals, Virtue, Common Good, Speech
More from The Thomistic Institute
Prof. Scott Cleveland explores the Aristotelian and Thomistic vision of friendship, arguing that true flourishing requires overcoming the vices of envy and apathy through the practice of charity and virtuous love.
Prof. Erik Dempsey explores Original Sin as a fundamental, lived reality inherently inclining the human person toward wrongdoing, but recognizing our brokenness is essential for understanding our constant need for divine grace and justification.
Prof. Adam Eitel argues that modern identity theories ultimately fail because they lack a stable metaphysical grounding, and he proposes an alternative view rooted in Saint Thomas Aquinas’s exposition of Psalm 8.
Fr. Irenaeus Dunlevy examines the contemporary crisis of identity by contrasting modern fluid subjectivism with the Thomistic realist perspective of the human person, arguing our true identity is rooted in our nature as beings created by God and ordered toward Him
Prof. Adam Eitel contrasts the modern, self-constituted notions of identity with the Thomistic understanding of man as a creature capable of seeing God., whereby our human identity is fundamentally reordered from the Adamic image to the image of Christ