The faith composed at Nicaea against the Arian heresy was sufficient: but because certain men with depraved cunning, under the confession of that faith, exchange it for impious words, casting envy upon us, as though we maintained the heresy of Sabellius; in a few words we set our seal both against Sabellius by the confession of the first faith, and against those who under the name of the catholic faith defend impious words, saying that there are three substances; whereas the catholic faith has always confessed one substance of the Father and of the Son and of the Holy Spirit. We believe the Father, who is not the Son, but has a Son begotten of himself without beginning, not made; and we believe the Son, who is not the Father, but has a Father, of whom he is begotten, not made;
and we believe the Holy Spirit, who is truly the Spirit of God. Whence also we confess one substance of the divine Trinity; since, such as the Father is according to substance, such also he begot the Son: and the Holy Spirit, not existing as a creature, but as the Spirit of God, is not foreign to the substance of the Father and of the Son; but he himself is of the same substance with the Father and the Son, as of the same deity. For let those who think us to be Apollinarians know that we abhor the heresy of Apollinaris no less than the Arian. But we marvel that those can be proved catholics, who confess three substances of the Father and of the Son and of the Holy Spirit.
But even if they say that they do not believe the Son of God or the Holy Spirit to be a creature, yet they hold an impious faith, when they say that there are three substances: for it is consequent that they confess three gods, who confess three substances. Which utterance the catholics have always abhorred.