Who, being in the form of God, thought it not a thing to be grasped to be equal with God:
All Commentaries on Philippians 2:6 Go To Philippians 2
John Chrysostom
AD 407
How can the wretched [Sabellius] say that Christ’s existence began from Mary? This implies that before this he did not exist. But Paul says that “being the form of God he took the form of a slave.” … The form of a slave is truly a slave and nothing less. So too the form of God is truly God and nothing less. Paul did not write that he was in process of coming to be in the form of God; rather “being in the form of God,” hence truly divine. This is as much as to say “I am that I am.” .