Ephesians 3:4

“Whereby when ye read, &c.] 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.”

“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 (Ti2 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).”

“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…”

“ye may: Mat 13:11; Co1 2:6, Co1 2:7, Co1 13:2; Co2 11:6 the mystery: Eph 1:9, Eph 5:32, Eph 6:19; Luk 2:10, Luk 2:11, Luk 8:10; Co1 4:1; Col 2:2, Col 4:3; Ti1 3:9, Ti1 3:16 Ephesians 3:5”