11 Now some unbelieving Arian may come forth and say that “the Word of God was made.” How can it be that the Word of God was made, when God by the Word made all things? If the Word of God was itself also made, by what other Word was it made? But if you say that there is a Word of the Word, I say, that by which it was made is itself the only Son of God. But if you do not say there is a Word of the Word, allow that that was not made by which all things were made. For that by which all things were made could not be made by itself. Believe the evangelist then. For he might have said, “In the beginning God made the Word:” even as Moses said, “In the beginning God made the heavens and the earth;” and enumerates all things thus: “God said, Let it be made, and it was made.” If “said,” who said? God. And what was made? Some creature. Between the speaking of God and the making of the creature, what was there by which it was made but the Word? For God said, “Let it be made, and it was made.” This Word is unchangeable; although changeable things are made by it, the Word itself is unchangeable.
Source: Tractates on the Gospel of John (New Advent)