4:10-18 Paul had differed with Barnabas, on the account of this Mark, yet he is not only reconciled, but recommends him to the churches; an example of a truly Christian and forgiving spirit. If men have been guilty of a fault, it must not always be remembered against them. We must forget as well as forgive. The apostle had comfort in the communion of saints and ministers. One is his fellow-servant, another his fellow-prisoner, and all his fellow-workers, working out their own salvation, and endeavouring to promote the salvation of others. The effectual, fervent prayer is the prevailing prayer, and availeth much. The smiles, flatteries, or frowns of the world, the spirit of error, or the working of self-love, leads many to a way of preaching and living which comes far short of fulfilling their ministry. But those who preach the same doctrine as Paul, and follow his example, may expect the Divine favour and blessing.
11. Justus—that is, righteous; a common name among the Jews; Hebrew, "tzadik" (Ac 1:23).
of the circumcision—This implies that Epaphras, Luke, and Demas (Col 4:12, 14) were not of the circumcision. This agrees with Luke's Gentile name (the same as Lucanus), and the Gentile aspect of his Gospel.
These only, &c.—namely, of the Jews. For the Jewish teachers were generally opposed to the apostle of the Gentiles (Php 1:15). Epaphras, &c., were also fellow laborers, but Gentiles.
unto—that is, in promoting the Gospel kingdom.
which have been—Greek, "which have been made," or "have become," that is, inasmuch as they have become a comfort to me. The Greek implies comfort in forensic dangers; a different Greek word expresses comfort in domestic affliction [Bengel].