- Of the one only true principle which alone purifies and renews human nature.
Accordingly, when we speak of God, we do not affirm two or three principles, no more than we are at liberty to affirm two or three gods; although, speaking of each, of the Father, or of the Son, or of the Holy Ghost, we confess that each is God: and yet we do not say, as the Sabellian heretics say, that the Father is the same as the Son, and the Holy Spirit the same as the Father and the Son; but we say that the Father is the Father of the Son, and the Son the Son of the Father, and that the Holy Spirit of the Father and the Son is neither the Father nor the Son. It was therefore truly said that man is cleansed only by a Principle, although the Platonists erred in speaking in the plural of principles. But Porphyry, being under the dominion of these envious powers, whose influence he was at once ashamed of and afraid to throw off, refused to recognise