This lecture was given at the Catholic University of America on May 16, 2023 as part of the Thomistic Institute symposium titled "Toward a Fundamental Theology of the Priesthood." For more information on upcoming events, please visit our website at www.thomisticinstitute.org. About the speaker: Cardinal Marc Oullet served as prefect of the Dicastery for Bishops and president of the Pontifical Commission for Latin America from 2010 to 2023. He was Archbishop of Quebec and Primate of Canada from 2003 to 2010. He was made a cardinal by Pope John Paul II in 2003. He holds licentiates in theology and philosophy, and a doctorate in dogmatic theology.