Galatians 2:8

(Vers. 7, 8.) But on the contrary, when they saw that I had been entrusted with the gospel for the uncircumcised, just as Peter had been entrusted with the gospel for the circumcised (for he who worked through Peter for his apostolic ministry to the circumcised worked also through me for mine to the Gentiles), and when James and Cephas and John, who seemed to be pillars, perceived the grace that was given to me, they gave the right hand of fellowship to Barnabas and me, that we should go to the Gentiles and they to the circumcised. Ὑπέρβατον est, et multis quae in medio sunt interjecta sublatis, sic breviter legi potest: Mihi enim qui videbantur esse nihil contulerunt: sed econtra dexteras dederunt mihi et Barnabae, societatis. Aut certe ille absque jactatione sui, occultus est sensus: Mihi qui videbantur esse aliquid, nihil contulerunt; sed econtra a me eis collatum est, dum fiunt in Evangelii gratia firmiores. Totum autem quod dicit, hoc est: unus atque idem mihi Evangelium praeputii, et Petro circumcisionis credidit. He sent me to the Gentiles, and he appointed him in Judea. Neither could the Gentiles, who were no longer young and could not benefit from the pain of circumcision, abstain from the foods they had always been accustomed to and that God had created for them to use; nor could those who believed and were circumcised from the Jews, and who, by custom, thought they had more than the other Gentiles, easily despise the things in which they boasted. Therefore, by the providence of God, one apostle was given to the circumcised, who seemed to acquiesce to the shadows of the Law, while another was given to those who were uncircumcised, who did not consider the grace of the Gospel to be slavery, but rather free faith. Lest any impediment to faith arise under any occasion: and because of circumcision or uncircumcision, one would not believe in Christ. […]

Paul allows that Peter, following Jewish custom, was without blame in his temporary observation of what was amiss so as not to lose those entrusted to him. But it was Paul's own duty for the sake of the gospel truth to do what was entrusted to him among the uncircumcised, so that the Gentiles would not depart from their faith and belief in Christ through fear of the burdens and rigor of the law.

"For He that wrought for Peter unto the Apostleship of the Circumcision wrought for me also unto the Gentiles." He calls the Gentiles the Uncircumcision and the Jews the Circumcision, and declares his own rank to be equal to that of the Apostles; and, by comparing himself with their Leader not with the others, he shows that the dignity of each was the same. After he had established the proof of their unanimity, he takes courage, and proceeds confidently in his argument, not stopping at the Apostles, but advances to Christ Himself, and to the grace which He had conferred upon him, and calls the Apostles as his witnesses.

[PHOTIUS] "just as Peter." If Paul said that those around Peter practice circumcision for reasons of convenience, he would seem even to allow this himself, and therefore by cooperating all the more he would have been shown to be for those with whom he had …

But because someone might say: What evidence have you that the commission to preach the Gospel to the Gentiles was given you, he interjects that it was through certain works of Christ. For just as it is evident that Peter received the Gospel from Christ …