IV. Epistle to Dionysius Bishop of Rome
11 That neither must this saying be thus blamed; for he says that he used the name of Maker on account of the flesh which the Word had assumed, and which certainly was made. But if any one should suspect that that had been said of the Word, even this also was to be heard without contentiousness. For as I do not think that the Word was a thing made, so I do not say that God was its Maker, but its Father. Yet still, if at any time, discoursing of the Son, I may have casually said that God was His Maker, even this mode of speaking would not be without defence. For the wise men among the Greeks call themselves the makers of their books, although the same are fathers of their books. Moreover, divine Scripture calls us makers of those motions which proceed from the heart, when it calls us doers of the law of judgment and of justice.
From the Same Second Book.
12. In the beginning was the Word. But that was not the Word which produced the Word. For the Word was with God. The Lord is Wisdom; it was not therefore Wisdom that produced Wisdom; for “I was that” says He, wherein He delighted Christ is truth; but “blessed,” says He, “is the God of truth.”
From the Third Book.
13. Life is begotten of life in the same way as the river has flowed forth from the spring, and the brilliant light is ignited from the inextinguishable light.
From the Fourth Book.
14. Even as our mind emits from itself a word, — as says the prophet, “My heart has uttered forth a good word,” — and each of the two is distinct the one from the other, and maintaining a peculiar place, and one that is distinguished from the other; since the former indeed abides and is stirred in the heart, while the latter has its place in the tongue and in the mouth. And yet they are not apart from one another, nor deprived of one another; neither is the mind without the word, nor is the word without the mind; but the mind makes the word and appears in the word, and the word exhibits the mind wherein it was made. And the mind indeed is, as it were, the word immanent, while the word is the mind breaking forth. The mind passes into the word, and the word transmits the mind to the surrounding hearers; and thus the mind by means of the word takes its place in the souls of the hearers, entering in at the same time as the word. And indeed the mind is, as it were, the father of the word, existing in itself; but the word is as the son of the mind, and cannot be made before it nor without it, but exists with it, whence it has taken its seed and origin. In the same manner, also, the Almighty Father and Universal Mind has before all things the Son, the Word, and the discourse, as the interpreter and messenger of Himself.
About the Middle of the Treatise.
15. If, from the fact that there are three hypostases, they say that they are divided, there are three whether they like it or no, or else let them get rid of the divine Trinity altogether.
And Again:
For on this account after the Unity there is also the most divine Trinity.
The Conclusion of the Entire Treatise.
16. In accordance with all these things, the: form, moreover, and rule being received from the elders who have lived before us, we also, with a voice in accordance with them, will both acquit ourselves of thanks to you, and of the letter which we are now writing. And to God the Father, and His Son our Lord Jesus Christ, with the Holy Spirit, be glory and dominion for ever and ever. Amen.
Source: Miscellaneous Fragments (New Advent)