The Book of Philemon - "Searchlights from the Word" by G. Campbell Morgan.
That the fellowship of thy faith may become effectual.
That was the burden of Paul's prayer for Philemon; and in sending Onesimus back to him, he was creating a new opportunity for his realization of that very thing. Philemon had faith, as Paul had already said; and it was a double faith, "toward the Lord Jesus, and toward all the saints." That faith necessarily placed him in the realm of fellowship, and that was also two-sided: fellowship with the Lord Jesus, and fellowship with all the saints. Such was his faith, his conviction, that to which he had yielded himself. Such was his fellowship, his vital relationship, the good thing which was in him. Paul's prayer for him was that it might be effectual; that is, effective. Faith and fellowship are at once made valuable and vindicated as they are active. While a number of names are found in this letter, three stand out prominently, those of Paul, Philemon, and Onesimus. They share a common faith; they are members of one fellowship. The circumstances were such as to give the fellowship of their faith an opportunity for action; that is, to become effectual. It was so in the case of Paul, as he sent Onesimus back to his master, even though he would have been serviceable to himself in his prison. It was so in the case of Onesimus, in that he went back to the master whom he had wronged in running away from him. The letter was written that it might be so in the case of Philemon as he received Onesimus, "no longer as a servant ... but a brother beloved."