Each year on the first Sunday after Pentecost we celebrate the Solemnity of the Most Holy Trinity, also known as Trinity Sunday. Although it wasn’t until 1334 that Pope John XXII officially established the feast for universal observance in the Western Church, the mystery of the Holy Trinity has been the pulse of the Church’s life since the very beginning. The Trinity is “the central mystery of Christian faith and life…[and is] the source of all the other mysteries of faith” (CCC 234). The whole of the Church’s life flows from the central belief that the one true God exists as three divine Persons—Father, Son, and Holy Spirit.
