Jerome : Those who wanted the Galatians to be circumcised had put it about that Paul preached one way and acted another, destroying his words by his own deeds, since he who proclaimed the abolition of the law was found to be obeying the law. Because Paul could not refute their opinions in person in the sight of all (being prevented by the chains that he bore as a testimony to Christ), he acts as his own lawyer through his letter. So that no suspicion that the letter was false might arise, he himself has written it from this point right to the end, showing that the preceding part was copied by another's hand. … It is not that the letters were larger (though indeed the word would bear this sense in Greek) but because the marks of his own handwriting were known to them. So when they recognized the angles and contours of his own letters, they would feel that they had encountered him.… Paul wrote his letter in great characters because the meaning of the characters was great and had been traced out by the Spirit of God, not merely by pen and ink. — EPISTLE TO THE Galatians 3.6.11 Jerome : (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. Finally, writing to the Corinthians, among whom there were schisms and heresies, with each one saying, 'I am of Paul,' and 'I am of Apollos,' and 'I am of Cephas' (I Cor. 1:12), he signed his letter with this annotation: My greeting [is] in the hand of Paul: If anyone does not love the Lord Jesus Christ, let him be anathema. Maranatha, and so on. Therefore, desiring to remove any occasion for false teachers who had corrupted the Galatians from the truth of the Gospel, he completed the end of the letter with the annotation of his hand, saying: See with what letters I have written to you; not that the letters were large (for this indeed signifies 'great' in Greek), but that his hand was known to them by distinct traces, so that while they recognize the tops of the letters, they might suppose that they were seeing the very person who had written [the letter]. In this place, a man most learned in our times, I wonder how he spoke such a ridiculous thing. Paul, he says, was a Hebrew and did not know Greek letters. And because necessity demanded it, that he himself would subscribe the letter by his own hand, contrary to the usual curving paths of the letters, he barely expressed with large points: also showing in this his signs of love towards the Galatians, that for their sake he would even attempt that which he could not. Paul, the great writer, wrote a letter, because there was great meaning in his words, and it was written with the Holy Spirit, not with ink or pen. But what he added, with my hand, let us understand in his works. For this reason, it is often written in the prophets: The word of God that was made in the hand of Jeremiah, or Haggai, so that we also know through this similarity that the word of God was made in the hand of Paul. Paul writes great letters not only to the Galatians back then, but also to everyone today, and although the tips with which his letters are written are small, the letters themselves are great, because there is great meaning in them. — Commentary on Galatians John Chrysostom : "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." — Homily on Galatians 6 Oecumenius : 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, my confession is set down in my own hand, that I do not preach circumcision as those who slanderously say. — Commentary on Galatians