St. Patrick on God as Trinity

This is because there is no other God, nor will there ever be, nor was there ever, except God the Father.

He is the one who was not begotten, the one without a beginning, the one from whom all beginnings come, the one who holds all things in being – this is our teaching.

And his son, Jesus Christ, whom we testify has always been, since before the beginning of this age, with the Father in a spiritual way. He was begotten in an indescribable way before every beginning.

Everything we can see, and everything beyond our sight, was made through him. He became a human being; and, having overcome death, was welcomed to the heavens to the Father.

The Father gave him all power over every being, both heavenly and earthly and beneath the earth. Let every tongue confess that Jesus Christ, in whom we believe and whom we await to come back to us in the near future, is Lord and God^[Nota].

He is judge of the living and of the dead^[Nota]; he rewards every person according to their deeds^[Nota].

He has generously poured on us the Holy Spirit^[Nota], the gift and promise of immortality, who makes believers and those who listen to be children of God and co-heirs with Christ^[Nota].

This is the one we acknowledge and adore – one God in a trinity of the sacred name…

In the knowledge of this faith in the Trinity, and without letting the dangers prevent it, it is right to make known the gift of God and his eternal consolation.

It is right to spread abroad the name of God faithfully and without fear, so that even after my death I may leave something of value to the many thousands of my brothers and sisters – the children whom I baptised in the Lord. (St. Patrick’s Confessio)

4. For there is no other God, nor ever was before, nor shall be hereafter, but God the Father, unbegotten and without beginning, in whom all things began, whose are all things, as we have been taught; and his son Jesus Christ, who manifestly always existed with the Father, before the beginning of time in the spirit with the Father, indescribably begotten before all things, and all things visible and invisible were made by him.

He was made man, conquered death and was received into Heaven, to the Father who gave him all power over every name in Heaven and on Earth and in Hell, so that every tongue should confess that Jesus Christ is Lord and God, in whom we believe.

And we look to his imminent coming again, the judge of the living and the dead, who will render to each according to his deeds.

And he poured out his Holy Spirit on us in abundance, the gift and pledge of immortality, which makes the believers and the obedient into sons of God and co-heirs of Christ who is revealed, and we worship one God in the Trinity of holy name. (Confession of St. Patrick)