…Tertullian, who calls this management of St. Peter, a fault of conversation, not of preaching or doctrine… Tertullian and most interpreters take notice, that St. Peter’s fault was only a lesser or venial sin in his conduct and conversation. Did not St. Paul on several occasions do the like, as what is here laid to St. Peter’s charge? that is, practise the Jewish ceremonies: did not he circumcise Timothy after this, an. 52[A.D. 52]? did he not shave his head in Cenchrea, an. 54? did he not by the advice of St. James (an. 58.) purify himself with the Jews in the temple, not to offend them? St. Jerome, and also St. Chrysostom,[2] give another exposition of this passage. They looked upon all this to have been done by a contrivance and a collusion betwixt these two apostles, who had agreed beforehand that St. Peter should let himself be reprehended by St. Paul, (for this they take to be signified by the Greek text) and not that St. Peter was reprehensible;[3] so that the Jews seeing St. Peter publicly blamed, and not justifying himself, might for the future eat with the Gentiles. But St. Augustine vigorously opposed this exposition of St. Jerome, as less consistent with a Christian and apostolical sincerity, and with the text in this chapter, where it is called a dissimulation, and that Cephas or Peter walked not uprightly to the truth of the gospel. After a long dispute betwixt these two doctors, St. Jerome seems to have retracted his opinion, and the opinion of St. Augustine is commonly followed, that St. Peter was guilty of a venial fault of imprudence. In the mean time, no Catholic denies but that the head of the Church may be guilty even of great sins. What we have to admire, is the humility of St. Peter on this occasion, as St. Cyprian observes,[4] who took the reprehension so mildly, without alleging the primacy, which our Lord had given him. Baronius held that St. Peter did not sin at all, which may be true, if we look upon his intention only, which was to give no offence to the Jewish converts; but if we examine the fact, he can scarce be excused from a venial indiscretion. (Witham) — I withstood, &c. The fault that is here noted in the conduct of St. Peter, was only a certain imprudence, in withdrawing himself from the table of the Gentiles, for fear of giving offence to the Jewish converts: but this in such circumstances, when his so doing might be of ill consequence to the Gentiles, who might be induced thereby to think themselves obliged to conform to the Jewish way of living, to the prejudice of their Christian liberty. Neither was St. Paul’s reprehending him any argument against his supremacy; for is such cases an inferior may, and sometimes ought, with respect, to admonish his superior. (Challoner)