This lecture was delivered to Sydney University Catholic Society’s Mission Week on October 23, 2021 via Zoom. For more information on upcoming events, please visit our website at www.thomisticinstitute.org. About the speaker: Fr. Dominic Legge, O.P., is the Director of the Thomistic Institute and Assistant Professor in Systematic Theology at the Pontifical Faculty of the Immaculate Conception in Washington, D.C. He holds a J.D. from Yale Law School, a Ph.L. from the School of Philosophy of the Catholic University of America, and a doctorate in Sacred Theology from the University of Fribourg in Switzerland. He entered the Order of Preachers in 2001 after practicing constitutional law for several years as a trial attorney for the U.S. Department of Justice. He has also taught at The Catholic University of America Law School and at Providence College. He is the author of The Trinitarian Christology of St. Thomas Aquinas (Oxford University Press, 2016).