3:1-7 For having preached the doctrine of truth, the apostle was a prisoner, but a prisoner of Jesus Christ; the object of special protection and care, while thus suffering for him. All the gracious offers of the gospel, and the joyful tidings it contains, come from the rich grace of God; it is the great means by which the Spirit works grace in the souls of men. The mystery, is that secret, hidden purpose of salvation through Christ. This was not so fully and clearly shown in the ages before Christ, as unto the prophets of the New Testament. This was the great truth made known to the apostle, that God would call the Gentiles to salvation by faith in Christ. An effectual working of Divine power attends the gifts of Divine grace. As God appointed Paul to the office, so he qualified him for it.

5. in other ages—Greek, "generations."

not made known—He does not say, "has not been revealed." Making known by revelation is the source of making known by preaching [Bengel]. The former was vouchsafed only to the prophets, in order that they might make known the truth so revealed to men in general.

unto the sons of men—men in their state by birth, as contrasted with those illuminated "by the Spirit" (Greek, "IN the Spirit," compare Re 1:10), Mt 16:17.

as—The mystery of the call of the Gentiles (of which Paul speaks here) was not unknown to the Old Testament prophets (Isa 56:6, 7; 49:6). But they did not know it with the same explicit distinctness "As" it has been now known (Ac 10:19, 20; 11:18-21). They probably did not know that the Gentiles were to be admitted without circumcision or that they were to be on a level with the Jews in partaking of the grace of God. The gift of "the Spirit" in its fulness was reserved for the New Testament that Christ might thereby be glorified. The epithet, "holy," marks the special consecration of the New Testament "prophets" (who are here meant) by the Spirit, compared with which even the Old Testament prophets were but "sons of men" (Eze 2:3, and elsewhere).