7:17-24 The rules of Christianity reach every condition; and in every state a man may live so as to be a credit to it. It is the duty of every Christian to be content with his lot, and to conduct himself in his rank and place as becomes a Christian. Our comfort and happiness depend on what we are to Christ, not what we are in the world. No man should think to make his faith or religion, an argument to break through any natural or civil obligations. He should quietly and contentedly abide in the condition in which he is placed by Divine Providence.
17. But—Greek, "If not." "Only." Caution that believers should not make this direction (1Co 7:16; as Alford explains it) a ground for separating "of themselves" (1Co 7:12-14). Or, But if there be no hope of gaining over the unbeliever, still let the general principle be maintained, "As the Lord hath allotted to each, as God hath called each, so let him walk" (so the Greek in the oldest reading); let him walk in the path allotted to him and wherein he was called. The heavenly calling does not set aside our earthly callings.
so ordain I in all churches—Ye also therefore should obey.