Galatians 2:14

So that one might fulfill the works of the law, his infirmity being assisted not by his own merit but by the grace of God, they were not to demand from the Gentiles a fleshly observation of the law but were to understand that through the same grace of God they were able to fulfill the spiritual works of the law.

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.

The apostle Peter would not have been rebuked if he had separated himself from the Gentiles for fear of giving scandal to the Jews. But what was rebuked in the apostle Peter was that, when he previously had been living in Gentile fashion with believers, …

Then when he says, "But, when I saw that they walked not uprightly unto the truth of the gospel, I said to Cephas before them all...," he explains what he had said concerning the rebuke with which he rebuked Peter. As to this he does …

But do not be troubled by these words — he says this not to condemn Peter, but for the sake of those who could benefit from hearing that even Peter was subjected to rebuke for his attachment to the law. Why then should you hold …

I said to Cephas before them all - See Paul single against Peter and all the Jews! If thou being a Jew, yet livest, in thy ordinary conversation, after the manner of the gentiles - Not observing the ceremonial law, which thou knowest to be now abolished.

Antioch was one of the chief churches of the Gentile Christians, as Jerusalem was of those Christians who turned from Judaism to the faith of Christ. There is no colour of reason for the supposition that Peter was bishop of Antioch.

But when I saw that they walked not uprightly,....

That they walked not uprightly - Ουκ ορθοποδουσι· They did not walk with a straight step - they did not maintain a firm footing. According to the truth of the Gospel - According to that true doctrine, which states that Christ is the end of the law for justification to every one that believes; and that such are under no obligation to observe circumcision and the other peculiar rites and ceremonies of the law. If thou, being a Jew, livest - This was a cutting reproof.

walked not uprightly--literally, "straight": "were not walking with straightforward steps." Compare Ga 6:16. truth of the gospel--which teaches that justification by legal works and observances is inconsistent with redemption by Christ.

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But when I saw that they walked not uprightly - To walk, in the Scriptures, is usually expressive of conduct or deportment; and the idea here is, that their conduct in this case was not honest. According to the truth of the gospel - According to the true spirit and design of the gospel. That requires perfect honesty and integrity; and as that was the rule by which Paul regulated his life, and by which he felt that all ought to regulate their conduct, he felt himself called on openly to reprove the principal person who had been in fault. The spirit of the world is crafty, cunning, and crooked. The gospel would correct all that wily policy, and would lead man in a path of entire honesty and truth. I said unto Peter before them all - That is, probably, before all the church, or certainly before all who had offended with him in the case. Had this been a private affair, Paul would doubtless have sought a private interview with Peter, and would have remonstrated with him in private on the subject. But it was public. It was a case where many were involved, and where the interests of the church were at stake. It was a case where it was very important to establish some fixed and just principles, and he therefore took occasion to remonstrate with him in public on the subject. This might have been at the close of public worship; or it may have been that the subject came up for debate in some of their public meetings, whether the rites of the Jews were to be imposed on the Gentile converts. This was a question which agitated all the churches where the Jewish and Gentile converts were intermingled; and it would not be strange that it should be the subject of public debate at Antioch. […]