(8, 9) Wherefore... for love’s sake... — Still the same idea runs on. Philemon’s love, shown in Christian fellowship, is in the Apostle’s mind; “therefore,” he adds, “for love’s sake” — speaking in the spirit of love, to which he knew there would be a ready response — he will not command, as an Apostle, what is “convenient,” i.e., seemly, in a Christian (comp. Ephesians 5:14; Colossians 3:18), but will “entreat” as a brother.
(9) Paul the aged, and now also a prisoner of Jesus Christ. — At this time St. Paul must have been between fifty and sixty, and after a life of unexampled labour and suffering he might well call himself “aged,” not, perhaps, in comparison with Philemon, but in relation to his need of ministry from his “son” Onesimus. It has been suggested by Dr. Lightfoot that we should read here (by a slight change, or without any change, in the original), the ambassador, and also the prisoner, of Jesus Christ. The parallel with Ephesians 6:20 — “for which I am an ambassador in bonds” — and, indeed, with the tone in which St. Paul in the other Epistles speaks of his captivity as his glory, is tempting. But the change seems to take much from the peculiar beauty and pathos of the passage; which from its appeal to love, rather than to authority, suits especially with the thought, not of the glory of ambassadorship for Christ, but of the weakness of an old age suffering in chains.