1. Give close attention, and try to understand, beloved; for while it is we who speak it is He Himself who never withdraweth His presence from us who is our Teacher. The Lord saith, what you have just heard read, “The words that I speak unto you, I speak not of myself: but the Father, that dwelleth in me, He doeth the works.” Even His words, then, are works? Clearly so. For surely he that edifies a neighbor by what he says, works a good work. But what mean the words, “I speak not of myself,” but, I who speak am not of myself? Hence He attributes what He does to Him, of whom He, that doeth them, is. For the Father is not God [as born, etc.] of any one else, while the Son is God, as equal, indeed, to the Father, but [as born] of God the Father. Therefore the former is God, but not of God; and the Light, but not of light: whereas the latter is God of God, Light of Light.
Complete source paragraph · Tractates on the Gospel of John, Tractate 71, source paragraph 3 · Original source