Whereby, when ye read - By the bare reading of which you may understand the view which I entertain of the plan of salvation, and the knowledge which I have of God's method of saving people, particularly of his intention in regard to the salvation of the Gentiles.

In the mystery of Christ - This does not refer to anything "mysterious" in the person of Christ; or the union of the divine and human nature in him; or to anything difficult of apprehension in the work of the atonement. It means the hitherto concealed doctrine that through the Messiah, the Gentiles were to be received to the same privileges as the Jews, and that the plan of salvation was to be made equally free for all. This great truth had been hitherto concealed, or but partially understood, and Paul says that he was appointed to make it known to the world. His "knowledge" on the subject, he says, could be understood by what he had said, and from that they could judge whether he was qualified to state and defend the doctrines of the gospel. Paul evidently supposed that the knowledge which he had on that subject was of eminent value; that it was possessed by few; that it was important to understand it. Hence he dwells upon it. He speaks of the glory of that truth. He traces it back to the counsels of God. He shows that it entered into his eternal plans; and he evidently felt that the truth which he had communicated in the former part of this Epistle, was among the most important that could come before the mind.

Whereby, when ye read - When ye refer back to them.

Ye may understand my knowledge - Ye may see what God has given me to know concerning what has been hitherto a mystery - the calling of the Gentiles, and the breaking down the middle wall between them and the Jews, so as to make both one spiritual body, and on the same conditions.

Whereby when ye read,.... The above chapters, and seriously consider what is contained in them:

ye may understand my knowledge in the mystery of Christ of his person, office, and grace; and which knowledge was very large indeed.

Whereby (πρὸς ὃ)

Lit., agreeably to which, namely, what he had written.

Mystery of Christ

The mystery which is Christ. See on Colossians 1:26; see on Romans 11:25.

Whereby, when ye read, ye may understand my knowledge in the mystery of Christ)

3:4 Whereby, when ye read, ye may understand my knowledge in the mystery of Christ. When they read what he wrote above (before), and what he writes now, they can perceive his knowledge of this mystery.

Margin mystery

See Scofield Note: "Mt 13:11".

4. understand my knowledge-"perceive my understanding" [Alford], or "intelligence." "When ye read," implies that, deep as are the mysteries of this Epistle, the way for all to understand them is to read it (2Ti 3:15, 16). By perceiving his understanding of the mysteries, they, too, will be enabled to understand.

the mystery of Christ-The "mystery" is Christ Himself, once hidden, but now revealed (Col 1:27).

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.