This lecture was given on June 13, 2023, at the Dominican House of Studies in Washington, D.C., as part of the 2023 Civitas Dei Summer Fellowship: "Friendship, Happiness, and the Search for God: Aristotle, Augustine, & Aquinas." For more information on upcoming events, please visit our website: thomisticinstitute.org/upcoming-events Michael Gorman is professor of philosophy at The Catholic University of America. He has doctorates in philosophy and theology. He has authored over thirty academic papers and a book entitled Aquinas on the Metaphysics of the Hypostatic Union (Cambridge University Press, 2017). His main interests are metaphysics, human nature, and ethics.