Philemon 1:13
I wanted to keep him with me, so that he might serve me on your behalf during my imprisonment for the gospel — Paul's personal preference (eboulomēn) to retain Onesimus is overridden by respect for Philemon's rights. The service (diakonē) Onesimus would render compensates for Philemon's inability to help Paul during captivity. The phrase on your behalf (hyper sou) makes Onesimus a proxy for Philemon's unavailable presence — a substitute grace. Yet Paul chooses not to claim this right, deferring to Philemon's will.