Trinity Sunday

The Most Holy Trinity is celebrated on the Sunday after Pentecost. The feast does not mark a scene from the life of Jesus the way Christmas or Easter does. It gathers the whole mystery the Church has just lived: the Father sends the Son, the Son redeems, the Spirit is poured out. The preface of the day says that the true faith confesses the Trinity of Persons and the Unity of essence.

The solemnity entered the Western calendar in the Middle Ages and was extended to the Roman Rite by Pope John XXII in the fourteenth century. Its place after Pentecost is deliberate. Only after the mission of the Spirit does the Church pause to name the God who has acted. The vestments are white. The creed is professed with particular weight, and many parishes use the Athanasian Creed in devotion even though it is not required at Mass.

Catholics adore one God. The Father is not the Son, the Son is not the Spirit, and yet they are not three gods. This is not a puzzle set aside for specialists. It is the name in which every Christian is baptized, the shape of the Sign of the Cross, and the ending of the collects at Mass.

The date moves with Pentecost, and Pentecost moves with Easter. Trinity Sunday is always that next Sunday. It is not assigned to a fixed day of June.