The Trinity

For nothing at all of the divine and blessed Trinity is created.

but the manner of the divine begetting is unspeakable and inconceivable to human reasonings.

The Holy Spirit is numbered together with the Father and the Son, because he too is above creation;

Indeed, the following Scripture distinguishes between the persons:

Hold everywhere to this rule, which I have professed — by which I attest the Father and the Son and the Spirit to be inseparable from one another — and so you will recognize what is said, and how.

You, however, would make him a liar, deceiver, and beguiler of this faith, if, while he was himself his own son, he gave to another the person of a son — when all the Scriptures show forth both the demonstration and the distinction of the trinity, from which our prescription too is derived:

Go, he says, teach the nations, baptizing them into the name of the Father and of the Son and of the Holy Spirit.

So too the angel, the arbiter of baptism, makes the ways straight for the Holy Spirit who is to supervene, by the washing-away of transgressions which faith — sealed in the Father and the Son and the Holy Spirit — obtains.