On the day of Pentecost, the Holy Apostles received, as we have seen, the grace of the Holy Ghost. In accordance with the injunction of their divine Master, they will soon start on their mission of teaching all nations, and baptizing men in the name of the Holy Trinity. It was but right, then, that
the solemnity which is intended to honour the mystery of One God in Three Persons, should immediately follow that of Pentecost, with which it has a mysterious connection. And yet, it was not till after many centuries, that it was inserted in the Cycle of the Liturgical Year, whose completion is the work of successive ages.
Every homage paid to God by the Church’s Liturgy has the Holy Trinity as its object. Time, as well as eternity, belongs to the Trinity. The Trinity is the scope of all Religion. Every day, every hour, belongs to It.
Let us pray
Blessed be the holy Trinity, and undivided Unity: we will praise it, because it hath shown its mercy unto us.
Ps. O Lord, our Lord, how wonderful is Thy Name in the whole earth.
O almighty and everlasting God, who hast granted Thy servants, in the confession of the true faith, to acknowledge the glory of an eternal Trinity, and, in the power of majesty, to adore an Unity: we beseech Thee that, by the strength of this faith, we may be defended from all adversity.