3 that by revelation the mystery has been made known to me, (according as I have written before briefly, 4 by which, in reading it, ye can understand my intelligence in the mystery of the Christ,) 5 which in other generations has not been made known to the sons of men, as it has now been revealed to his holy apostles and prophets in [the power of the] Spirit, 6 that [they who are of] the nations should be joint heirs, and a joint body, and joint partakers of [his] promise in Christ Jesus by the glad tidings;
Matthew Henry's Commentary on Ephesians 3:3-6
Commentary on Ephesians 3:1-7
(Read Ephesians 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.