The feast of the Blessed Trinity was introduced in the 9th century and was added to the general calendar of the Church in 1331 by Pope John XXII.
The dogma we celebrate on this feast is this: there is one God and in this one God there are three Divine Persons; the Father is God, the Son is God, the Holy Spirit is God. Yet there are not three Gods, but one, eternal, incomprehensible God.
The feast of the Blessed Trinity can be seen as a kind of finale to all the preceding feasts: the mystery of the trinity is a synthesis of Christmas, Epiphany, Easter, Ascension, and Pentecost. All three divine Persons contributed to and shared in the work of redemption:
- The Father sent the Son to earth, for “God so loved the world as to give His only-begotten Son.” The Father called us to the faith.
- The Son, our Savior Jesus Christ, became man and died for us. He redeemed us and made us children of God.
- After Christ’s ascension, the Holy Spirit became our Teacher, our Leader, our Guide, our Consoler.