John Chrysostom
After exalting the Apostles and humbling himself, and then again placing himself above them in order to prove his equality with them, Paul continues to speak about the Apostles. He has proved equality by saying that he is both lower and higher than they are.
Having thus presented himself as a trustworthy teacher, he again places himself beside them, expressing unity of mind concerning Christ. He does this not as though he were merely joined to them, but so that he appears to have equal dignity with them. The benefit of the preaching required this.
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He is equally concerned that they should not think he is belittling the Apostles, and that the honor given to them should not lower him before those subject to him. Therefore he now again places himself on a level with them: "Therefore, whether it was I or they, so we preach." From whomever you wish to learn, he says, learn from him. We differ in nothing.
He did not say, "If you do not want to believe me, then believe them." Rather, he presents himself also as worthy of belief. He says that, as he is worthy of it by himself, so they also are worthy by themselves. The difference of persons meant nothing where the dignity was equal.
He does the same in the Epistle to the Galatians, addressing the Apostles not because he needed them, and affirming that he himself lacked nothing: "From those who seemed to be something. Whatever they were, it makes no difference to me." Yet he wishes to be in agreement with them: "they gave me and Barnabas the right hand of fellowship" (Gal 2:6, 9).
If Paul's reliability depended on others and rested on the testimony of others, extreme harm would have come to the disciples. Therefore he exalts himself not from vainglory, but out of concern for the preaching. For this reason he also places himself on a level with the Apostles here: "whether I or they, so we preach."
He rightly said, "we preach," expressing great boldness. We do not preach secretly or in hiding, he says, but proclaim louder than a trumpet. He did not say, "we preached," but even now, "so we preach." "And so you believed." Here he did not say, "you believe," but "you believed." Since the Corinthians were wavering, he turns to former times and presents them as witnesses against themselves.
When I speak of Paul, I mean not him alone, but also Peter, James, John, and their whole company. As in one lyre, though the strings are different, the harmony is one, so in the company of the Apostles, though the persons are different, the teaching is one. For there was one Artist, the Holy Spirit, who moved their souls. Paul expresses this when he says, "Therefore, whether it was I or they, so we preach" (1 Cor 15:11).