Grace be to you and peace from God the Father, and from our Lord Jesus Christ,
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Ambrosiaster
AD 400
He shows that the human race is sustained by the goodness of both, as much Father as Son. Nor does he indicate that the Son is less than the Father when he calls him our Lord, nor that the Father is greater when he calls him our God. He will not be a true Father unless he is also Lord, nor will the Son be a true Lord unless he is also God.
He calls God “Father” here not to flatter them but vehemently reproving them and reminding them how it was that they became sons. For it was not through the law but through the bath of regeneration that they were deemed worthy of this honor…. “You slaves and enemies and aliens,” [he says], “why are you so quick to call God your Father? Surely it was not the law that gave you this kinship? So why do you desert the one who was leading you to this sense of affiliation and return to your previous mentor?” Homily on Galatians
He lays this down everywhere, and especially now he writes to the Galatians, because they were running the risk of falling away from grace, and returning to circumcision.
