Galatians 6:12

"As many as desire to make a fair show in the flesh, they compel you to be circumcised; only that they may not be persecuted for the cross of Christ. For not even they who receive circumcision do themselves keep the Law; but they desire to have you circumcised, that they may glory in your flesh." Here he shows that they suffered this, not willingly but of necessity, and affords them an opportunity of retreat, almost speaking in their defence, and exhorting them to abandon their teachers with all speed. What is the meaning of "to make a fair show in the flesh?" it means, to be esteemed by men. As they were reviled by the Jews for deserting the customs of their fathers, they desire, says he, to injure you, that they may not have this charged against them, but vindicate themselves by means of your flesh. His object here is to show that they did not so act from respect to God; it is as if he said, This procedure is not founded in piety, all this is done through human ambition; in order that the unbelievers may be gratified by the mutilation of the faithful, they choose to offend God that they may please men; for this is the meaning of, "to make a fair show in the flesh." Then, as a proof that for another reason too they are unpardonable, he again convinces them that, not only in order to please others, but for their own vain glory, they had enjoined this. Wherefore he adds, "that they may glory in your flesh," as if they had disciples, and were teachers. And what is the proof of this? "For not even they themselves," he says, "keep the Law;" even if they did keep it, they would incur grave censure, but now their very purpose is corrupt.

"See with how large letters I have written unto you with mine own hand. As many as desire to make a fair show in the flesh, they compel you to be circumcised." Observe what grief posesses his blessed soul. As those who are oppressed with some sorrow, who have lost one of their own kindred, and suffered an unexpected calamity, rest neither by night nor day, because their grief besieges their soul, so the blessed Paul, after a short moral discourse, returns again to that former subject which chiefly disturbed his mind, saying as follows: "see with how large letters I have written unto you with mine own hand." By this he signifies that he had written the whole letter himself, which was a proof of great sincerity. In his other Epistles he himself only dictated, another wrote, as is plain from the Epistle to the Romans, for at its close it is said, "I Tertius, who write the Epistle, salute you;" (Rom. xvi: 22.) but in this instance he wrote the whole himself. And this he did by necessity, not from affection merely, but in order to remove an injurious suspicion. Being charged with acts wherein he had no part, and being reported to preach Circumcision yet to pretend to preach it not, he was compelled to write the Epistle with his own hand, thus laying up beforehand a written testimony. By the expression "what sized," he appears to me to signify, not the magnitude, but, the misshapen appearance of the letters, as if he had said, "Although not well skilled in writing, I have been compelled to write with my own hand to stop the mouth of these traducers."