Charles Ellicott Commentary Philemon 1:8-9

"Wherefore, though I have all boldness in Christ to enjoin thee that which is befitting, yet for love`s sake I rather beseech, being such a one as Paul the aged, and now a prisoner also of Christ Jesus:" — Philemon 1:8-9 (ASV)

Therefore . . . 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 (Colossians 3:18), but will “entreat” as a brother.

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, especially suits the thought, not of the glory of ambassadorship for Christ, but of the weakness of an old age suffering in chains.

On verses 8-20:

Here St. Paul enters on the main subject of his Letter—the recommendation to Philemon of his runaway slave, Onesimus. All thoughtful readers of the Epistle must recognise in this a peculiar courtesy and delicacy of tone, through which an affectionate earnestness shows itself, and an authority all the greater because it is not asserted in command.

The substance is equally notable in its bearing on slavery. Onesimus is doubly welcomed into the Christian family. He is St. Paul’s son in the faith: he is to Philemon a brother beloved in the Lord.

In that recognition is the truth to which, both in theory and in practice, we may look as the destruction of slavery.