This lecture was given on April 6, 2022 at Trinity College Dublin. For more information on upcoming events, please visit our website at www.thomisticinstitute.org. About the speaker: Fr. Alan O’Sullivan OP is an Irish Dominican. Ordained a priest in 2000 he studied at Blackfriars House of Studies, Oxford, where he obtained a Lectorate in Sacred Theology. His area of research focussed on “New Movements and Communities, Vatican II, and the Ecclesiology of Communion.” Having worked as a curate in a parish in Dublin for two years he went to study at the Angelicum, Rome, where he obtained a Licence in Sacred Theology. In 2012 he obtained his doctorate from Fribourg University, Switzerland. He specialises in moral theology, and lectures at the Dominican House of Studies, Dublin. He is currently Chaplain to Trinity College Dublin and Spiritual Director to Pure in Heart, Ireland. His book Self-Giving, Self-Mastery was published by Peter Lang in 2017.