18. But the Son is called both the Right Hand and the Power of God; if, then, we consider our words, there can be no perfection without power; let them therefore take care lest they think that which it is impious to say, namely, that the Father being but half perfect in His own Substance received perfection through the Son, and let them cease to deny that the Son is co-eternal with the Father. For when did the Power of God not exist? But if they think that at any time the Power of God existed not, they will say that at some time Perfection existed not in God the Father, to Whom they think that Power was at some time wanting.