The Solemnity of the Most Holy Trinity is celebrated on the Sunday following Pentecost. Trinity Sunday is one of the few feasts of the Church that celebrates a reality and doctrine rather than an event or saint. This feast remembers and honors the Holy Trinity; the union of the Father, Son and the Holy Spirit as one God. As a fundamental truth of the Christian faith, no one embraces Christianity without believing in the Holy Trinity. The Holy Trinity is the model of the Perfect Family. Here is a prayer to the Holy Trinity.
Father, you sent your Word to bring us truth and your Spirit to make us holy. Through them we come to know the mystery of your life. Help us to worship you, one God in Three Persons, by proclaiming and living our faith in you. We ask, this, Father, Son and Holy Spirit, one God, true and living, for ever and ever, Amen.