What one Christian can ask of another. Give up what is due you. Forget the wrongs that have been done to you.
Paul is so sure of Philemon's love, that he is willing to trust him, willing to ask him to do this hard thing.
Paul is asking something difficult of his friend. Am I willing to do that? Do I have friends that I allow to ask difficult things of me? What is noticeable about my faith toward the Lord Jesus?