Albert Barnes' Notes on the Whole Bible - Galatians 2:16
Knowing - We who are Jews by nature, or by birth. This cannot mean that all the Jews knew this, or that he who was a Jew knew it as a matter of course, for many Jews were ignorant of it, and many opposed it. But it means that the persons here referred to, those who had been born Jews, and who had been converted to Christianity, had had an opportunity to learn and understand this, which the Gentiles had not. This gospel had been preached to them, and they had professedly embraced it. They were... read more
The Pulpit Commentary - Galatians 2:16
Justification by faith. These words contain the pith and kernel of the Epistle. Occurring in historical narration, they strike the key-note of what is rather an expostulation and appeal to previous convictions than an original, calm argument, such as is the treatment of the same subject in the Epistle to the Romans. St. Paul says he convicted St. Peter of inconsistency in requiring Gentiles to Judaize, by reminding him that even they, Jews as they were, were not justified on account of... read more