“For this reason.” For what reason? Because of what was said before. Since you are such that you in every way refresh the hearts of the saints, I need not strain myself to act upon you by apostolic authority. It is enough to remind you of a need, and you certainly will not refuse to fulfill it. For if you do this for others, you will all the more gladly do it for me.
“Having boldness.” “The natural law of justice teaches that it is fitting for the teacher to give commands to the disciple,” says Ambrosiaster.
The Apostle clearly had in view restoring this law in Philemon’s consciousness. But because this could seem harsh, he softens it in every way. He says, “having boldness.” Boldness means access, freedom to speak to someone.
He presents Philemon as a great man, to whom not everyone has free access. He places himself among ordinary persons, suggesting that if he has anything special before Philemon in comparison with others, it depends on Philemon himself. Philemon himself gave him such free access to himself.
Then he adds: “in Christ.” This word could also suggest this thought: having authority in Christ, as an Apostle of Christ, I could command you. This is especially so for you, whom I begot to new life in Christ.
But since before this he used the word “boldness,” not “authority,” by the words “in Christ” he suggested another thought. Because of your strong faith in Christ the Lord, I have boldness to propose to you everything pleasing to the Lord. This is not by apostolic authority, but by confidence in your fervent faith in Christ the Lord. Thus I have boldness, or access, to speak to you.
The word “command” is also used for the sake of softening. It can mean to give an instruction, as though proposing: would it not be pleasing? And “what is required,” meaning fitting or suitable, is directed toward the same goal.
Saint Chrysostom says: “See how he takes care that even what was said from strong love should not strike the hearer or offend him. Therefore, before he said, ‘to command you,’ for such an expression was harsh, although, being spoken from love, it could very easily have reached its aim, he makes a reservation from excessive caution: ‘having boldness.’ By this he shows that Philemon was a great man. That is, he says: you yourself gave us boldness. Then he adds: ‘in Christ.’ By this he shows that he speaks so to Philemon because of his faith in Christ. Only then does he say, ‘to command you.’ And not only this, but also, ‘what is required,’ that is, a just matter. See by how many arguments he persuades Philemon. You show benefits to others, he says; show them also to me, and for Christ’s sake. Do this because the matter is just and because love requires it.”
The continuation is in verse 9.