John of Damascus — on Gal 2:14

“Namely that they did not cease altogether from [observing] the tradition of the Law. As we already said, he spoke in this way on account of the economy; for the whole event was an economy, including the rebuke made by Paul, and the silence and condescension of Peter. For both of them sought one thing, namely, that those who believed in Christ should cease to observe the Law. "If you are a Jew and live as a pagan, and not as a Jew." Namely, you do not keep the observance of the Law, but like those believers from the nations, you no longer keep the new months and the sabbaths. "How then do you force the nations to do this?" This too indicates the economy of this affair. Although he does not force you, nor does he attempt to persuade the nations to Judaize, Paul says that he does so that the rebuke addressed to Peter might be found to be a useful occasion to him with respect to his own disciples. By saying all this he educates the Galatians to easily cope with the weight of the rebuke for if Peter, being from the Jews, and persuading others to Judaize, was rebuked, and accepted the rebuke, as having been properly addressed to him, how much more should the Galatians, who are from the nations, and believed in Christ, and subjected themselves again to the slavery of the Law should accept the rebuke when it is addressed to them.”