Wherefore, if I come, I will remember his deeds which he doeth, prating against us with malicious words: and not content therewith, neither doth he himself receive the brethren, and forbiddeth them that would, and casteth them out of the church. If I come, I will remember - I will show him the authority which, as an apostle of Jesus Christ, Ipossess.
Prating against us - Diotrephes might have been a converted Jew, who was unwilling that the Gentiles should be received into the Church; or a Judaizing Christian, who wished to incorporate the law with the Gospel, and calumniated the apostles who taught otherwise. This haughty and unfeeling man would give no countenance to the converted Gentiles; so far from it, that he would not receive any of them himself, forbade others to do it, and excommunicated those who had been received into the Church by the apostles. This appears to be the meaning of neither doth he himself receive the brethren, and forbiddeth them that would, and casteth them out of the Church. He had the complete dog in the manger principle: he would neither do, nor let do; and when good was done that he did not approve, he endeavored to undo it.