Feasts & Saints

The Most Holy Trinity – 07 June

Feast instituted to honor the Most Holy Trinity. The early Church did not honor the Trinity by a special Office or day. When the Arian heresy was at its height, an Office with canticle, responses, a Preface, and hymns was composed by the Fathers, and recited on Sundays. Bishop Stephen of Liege, 903–920, wrote an Office of the Holy Trinity which was recited in some places on the Sunday after Pentecost, in others on the Sunday preceding Advent. Saint Thomas Becket, consecrated Archbishop of Canterbury on the Sunday following Pentecost, obtained for England the privilege of honoring the Holy Trinity on that day, and Pope John XXII (1316–1334) made this practise universal. A Plenary Indulgence is gained by those who receive the Holy Eucharist on this day. The Gospel of the Mass is the charge of Christ to His Apostles to teach all nations “baptizing them in the name of the Father, and of the Son, and of the Holy Ghost.” It is the last day in the United States for the observance of what is known as the Easter duty, so called because it is of obligation for all Catholics to confess and partake of Holy Comnlunion once a year, usually between the first Sunday of Lent and Trinity Sunday.

(universalis.com)

A letter by St Athanasius
Light, radiance and grace are in the Trinity and from the Trinity
It will not be out of place to consider the ancient tradition, teaching and faith of the Catholic Church, which was revealed by the Lord, proclaimed by the apostles and guarded by the fathers. For upon this faith the Church is built, and if anyone were to lapse from it, he would no longer be a Christian either in fact or in name.
  We acknowledge the Trinity, holy and perfect, to consist of the Father, the Son and the Holy Spirit. In this Trinity there is no intrusion of any alien element or of anything from outside, nor is the Trinity a blend of creative and created being. It is a wholly creative and energizing reality, self-consistent and undivided in its active power, for the Father makes all things through the Word and in the Holy Spirit, and in this way the unity of the holy Trinity is preserved. Accordingly, in the Church, one God is preached, one God who is above all things and through all things and in all things.God is above all things as Father, for he is principle and source; he is through all things through the Word; and he is in all things in the Holy Spirit.
  Writing to the Corinthians about spiritual matters, Paul traces all reality back to one God, the Father, saying: Now there are varieties of gifts, but the same Spirit; and there are varieties of service but the same Lord; and there are varieties of working, but it is the same God who inspires them all in everyone.
  Even the gifts that the Spirit dispenses to individuals are given by the Father through the Word. For all that belongs to the Father belongs also to the Son, and so the graces given by the Son in the Spirit are true gifts of the Father. Similarly, when the Spirit dwells in us, the Word who bestows the Spirit is in us too, and the Father is present in the Word. This is the meaning of the text: My Father and I will come to him and make our home with him. For where the light is, there also is the radiance; and where the radiance is, there too are its power and its resplendent grace.
  This is also Paul’s teaching in his second letter to the Corinthians: The grace of our Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all. For grace and the gift of the Trinity are given by the Father through the Son in the Holy Spirit. Just as grace is given from the Father through the Son, so there could be no communication of the gift to us except in the Holy Spirit. But when we share in the Spirit, we possess the love of the Father, the grace of the Son and the fellowship of the Spirit himself.
(Office of Readings)