The purpose of this course is to ponder, with the help of the theological tradition, the sense in which the Triune God can be understood as a mystery of communion of persons and how this account of the Deus Trinitas grounds the way man’s being images God. John Paul II wrote that “being a person in the image and likeness of God thus also involves existing in a relationship, in relation to the other ‘I.’ This is a prelude to the definitive self-revelation of the Triune God: a living unity in the communion of the Father, Son and Holy Spirit” (Mulieris dignitatem, 7). At the same time, he also said that “the primordial model of the family is to be sought in God Himself, in the trinitarian mystery of his life” (Letter to Families, 6). The trinitarian reflection carried out in the course is therefore at the service of laying out the theological basis for the anthropology and metaphysics of love as well as the sacramentality of marriage and soteriology elaborated by St. John Paul II.