Gregory of Nazianzus

And the Image as of one substance with Him, and because He is of the Father, and not the Father of Him. For this is of the Nature of an Image, to be the reproduction of its Archetype, and of that whose name it bears; only that there is more here. For in ordinary language an image is a motionless representation of that which has motion; but in this case it is the living reproduction of the Living One, and is more exactly like than was Seth to Adam, or any son to his father. For such is the nature of simple Existences, that it is not correct to say of them that they are Like in one particular and Unlike in another; but they are a complete resemblance, and should rather be called Identical than Like.