Galatians 6:11

The word "large" [πηλίκοις] does not indicate size, but rather the irregularity of the letters. As if he said: And although I know how to write these things well, nevertheless I have been forced to write the letter with my own hand, because, he says, …

(Verse 11) See with what letters I have written to you with my own hand. Those who wanted the Galatians to be circumcised had spread the rumor that Paul was doing one thing and preaching something else, and by his own actions, he was destroying the message. They claimed that anyone who asserted that the Law was abolished would themselves be found to be within the Law. Paul was unable to personally refute this belief with everyone present because he was restrained by the chains he bore for the sake of Christ's martyrdom. Therefore, he represents himself through letters. And so that no suspicion of forged letters should arise, he himself wrote by his own hand from this place to the end, showing that the previous [letters] were written by someone else. And he also demonstrates that letters were sent in his name by false teachers, writing to the Thessalonians: But we ask you, brothers, through the coming of our Lord Jesus Christ and our gathering together with him, not to be quickly shaken from your senses, nor be alarmed, either by spirit, or by word, or by letter supposedly from us, as if the day of the Lord is imminent, so that no one deceives you in any way (2 Thessalonians 2, 1 seqq.). And in order to dispel any suspicion of falsehood about the entire letter that he was sending, he subscribed with his own hand at the end, saying: My greeting in the hand of Paul, which is the sign in every letter; this is how I write. The grace of our Lord Jesus Christ be with all of you (2 Thess. 3:17-18). He also marked with his own hand the letters he dictated to the Colossians, saying: My greeting in the hand of Paul; remember my chains. And wherever he knew that false teachers were present, who could spread new doctrines through the authority of the Apostles, he subscribed the letter with his own hand. […]

"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."

After admonishing the Galatians how to behave towards men who are upright and just, the Apostle here teaches them how to act toward heretics and the perverse. First, he insinuates the way he is writing the admonition; Secondly, he sets forth the admonition (v. 12). …

Having spoken a little in a moral spirit, he again returns to the former matter that troubled his heart, and shows that he himself, with his own hand, wrote this entire epistle, not only to show his love for them, but also to destroy an …