c. 386–397 · John Chrysostom, Homilies on Second Corinthians 26.2
What he says then is this: God would not permit the Preaching to progress, in order to check our high thoughts; but permitted the adversaries to set upon us. For this indeed was enough to pluck down his high thoughts; not so that, pains in the head. And so by the “messenger of Satan,” he means Alexander the coppersmith, the party of Hymenæus and Philetus, all the adversaries of the word; those who contended with and fought against him, those that cast him into a prison, those that beat him, that led him away to death; for they did Satan’s business. As then he calls those Jews children of the devil, who were imitating his deeds, so also he calls a “messenger of Satan” every one that opposeth. He says therefore, “There was given to me a thorn to buffet me;” not as if God putteth arms into such men’s hands, God forbid! not that He doth chastise or punish, but for the time alloweth and permitteth them.