The doctrine of Sabellius might be expressed in two forms, either the Father became the Son, or the Son became the Father.  Both forms are here denied.  The Jerusalem Editor thinks there is an allusion to the Arian argument mentioned by Athanasius (c. Arian. Or. I. cap. vi. 22):  “If the Son is the Father’s offspring and Image, and is like in all things to the Father, then it necessarily holds that as He is begotten so He begets, and He too becomes father of a son.”  But the close connexion of the two clauses is in favour of the reference to the Sabellian υἱοπατορία.