17 We are still waiting, Fisherman, for your full description of the Word. He was in the beginning, it may be said, but perhaps He was not before the beginning. To this also I will furnish a reply on my Fisherman's behalf. The Word could not be other than He was; that was is unconditional and unlimited. But what says the Fisherman for himself? All things were made through Him. Thus, since nothing exists apart from Him through Whom the universe came into being, He, the Author of all things, must have an immeasurable existence. For time is a cognisable and divisible measure of extension, not in space, but in duration. All things are from Him, without exception; time then itself is His creature.
Source: On the Trinity (New Advent)