Now a mediator is not a mediator of one, but God is one.
All Commentaries on Galatians 3:20 Go To Galatians 3
John Chrysostom
AD 407
What can the heretics say to this? For as, according to them, the expression the Only True God excludes the Son from being true God, so here the phrase God is One, excludes Him from being God in any sense. But if, although the Father is called One God, the Son is nevertheless God, it is very plain that though the Father is called Very God, the Son is very God likewise. Now a mediator, says he, is between two parties; of whom then is Christ the Mediator? Plainly of God and of men. Observe, he says, that Christ also gave the Law; what therefore it was His to give, it is His to annul.