Philemon 1:9 - Matthew Poole's English Annotations on the Holy Bible

Yet for love's sake; writing to thee in a cause of love, where so good and charitable a man may have an opportunity to express his charity. Or rather, out of my love and kindness to thee, persuading me that I need not use my apostolical authority to such a brother and friend, I beseech thee. Being such an one as Paul the aged; being such a one as Paul now much in years, and not like to trouble thee long with any request. Or, Paul the elder by office, one who is thy brother in the ministry. And now also a prisoner of Jesus Christ; and now a prisoner for Christ's sake, and so cannot personally speak to thee; and I know such is thy piety, that my being a sufferer for the sake of Christ will not render my petition to thee lest acceptable, or to be regarded less.