Against the Sabellians

1 Now truly it would be just to dispute against those who, by dividing and rending the monarchy, which is the most august announcement of the Church of God, into, as it were, three powers, and distinct substances (hypostases), and three deities, destroy it. For I have heard that some who preach and teach the word of God among you are teachers of this opinion, who indeed diametrically, so to speak, are opposed to the opinion of Sabellius. For he blasphemes in saying that the Son Himself is the Father, and vice versa; but these in a certain manner announce three gods, in that they divide the holy unity into three different substances, absolutely separated from one another. For it is essential that the Divine Word should be united to the God of all, and that the Holy Spirit should abide and dwell in God; and thus that the Divine Trinity should be reduced and gathered into one, as if into a certain head—that is, into the omnipotent God of all. For the doctrine of the foolish Marcion, which cuts and divides the monarchy into three elements, is assuredly of the devil, and is not of Christ’s true disciples, or of those to whom the Saviour’s teaching is agreeable. For these indeed rightly know that the Trinity is declared in the divine Scripture, but that the doctrine that there are three gods is neither taught in the Old nor in the New Testament.