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: Dr. Grabowski earned his B.A. in theology at the University of Steubenville and his Ph.D. at Marquette University. For the last thirty years he has been on the faculty of the Catholic University of America in Washington, D.C. where he is currently Ordinary Professor of Moral Theology/ Ethics. He and his wife were appointed to the Pontifical Council for the Family by Pope Benedict XVI in the fall of 2009 where they served as a member couple. He has served two terms as a theological advisor to the U.S.C.C.B. Committee on Laity, Marriage, Family, and Youth and one term as an advisor to the subcommittee which produced the Pastoral Letter Marriage: Love and Life in the Divine Plan (2009). In 2015 he was appointed by Pope Francis to serve as an expert (adiutor) at the Synod of Bishops on the Family.