Fr. Cassian Derbes explores why friendship is a difficult but essential good, drawing on Aquinas, Aristotle, Cicero, Augustine, and Dante to show how hope, fortitude, and magnanimity help us overcome sloth and despair in pursuit of true friendship as a common good.

This lecture was given on January 18th, 2025, at Cedarbrake Catholic Retreat Center.

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

About the Speaker:

Fr. Cassian Derbes, O.P. is a priest of the Dominican Province of Saint Joseph. He is currently a visiting professor at the University of Notre Dame in the Mendoza College of Business. Father Cassian served recently as vice dean and professor of theology at the Pontifical University of Saint Thomas Aquinas (Angelicum) in Rome. His previous teaching positions include as adjunct professor of theology at the Pontifical College Josephinum in Ohio. Father Cassian earned his Doctorate in Sacred Theology (S.T.D.) from the Angelicum. He has a Licentiate in Sacred Theology (S.T.L.) from the Dominican House of Studies in Washington, DC, a Bachelor’s degree (B.A.) from New York University (N.Y.U.), and he is a graduate of Jesuit High School in New Orleans, Louisiana. From 2014-2020, Father Cassian served as director of an initiative at the Vatican under Pope Francis to design, implement, and teach an executive leadership development program for the Cardinals, Bishops, and senior lay officials of the Roman Curia. Father Cassian is a Missionary of Mercy, having been appointed by Pope Francis in 2015.

Keywords: Aquinas on Virtue, Aristotle, Augustine, Cicero’s De Amicitia, Common Good, Dante’s Divine Comedy, Fortitude and Magnanimity, Friendship and Hope, Sloth and Despair, Thomistic Philosophy