God made the world, and all which it contains, by His Word, and Reason, and Power. … The Word, and Reason, and Power, by which God made all, have spirit as their proper and essential substratum, in which the Word has in being to give forth utterances, and reason abides to dispose and arrange, and power is over all to execute. He proceeds forth from God, and in that procession He is generated; so that He is the Son of God, and is called God from unity of substance with God. For God, too, is a Spirit. Even when the ray is shot from the sun, it is still part of the parent mass; the sun will still be in the ray, because it is a ray of the sun—there is no division of substance, but merely an extension. Thus Christ is Spirit of Spirit, and God of God, as light of light is kindled. … That which has come forth out of God is at once God and the Son of God, and the two are one. In this way also, as He is Spirit of Spirit and God of God, He is made a second in manner of existence—in position, not in nature; and He did not withdraw from the original source, but went forth. This ray of God, then, as it was always foretold in ancient times, descending into a certain virgin, and made flesh in her womb, is in His birth God and man united. The flesh formed by the Spirit is nourished, grows up to manhood, speaks, teaches, works, and is the Christ.
— Apology XXI
