Ephesians 1:9

“Having made known unto us the mystery of his will, &c.] The Gospel, which is a mystery, a hidden mystery, the mystery of God and of Christ, and the mystery of the Gospel; the several doctrines of it are called the mysteries of the kingdom of heaven; such as are concerning the trinity of persons in the Godhead, the union of the two natures in Christ, his sonship and incarnation, the saints' union and communion with him, the work of the Spirit of God upon the soul, the calling of the Gentiles, and the conversion of the Jews, the resurrection of the dead, and the change of living saints: and the Gospel is the mystery of the will of God; of his will in saving sinners by Christ; and it declares…”

“"He hath abounded," or "made (grace) to abound toward us" (Eph 1:8), in that He made known to us, namely, experimentally, in our hearts. the mystery--God's purpose of redemption hidden heretofore in His counsels, but now revealed (Eph 6:19; Rom 16:25; Col 1:26-27). This "mystery" is not like the heathen mysteries, which were imparted only to the initiated few. All Christians are the initiated. Only unbelievers are the uninitiated. according to his good pleasure--showing the cause why "He hath made known to us the mystery," namely, His own loving "good pleasure" toward us; also the time and manner of His doing so, are according to His good pleasure. purposed-- (Eph 1:11). in himself--God the…”

“Having made known to us the mystery of his will - The word “mystery” (μυστήριον mustērion) means literally something into which one must be “initiated” before it is fully known (from μυέω mueō, to initiate, to instruct); and then anything which is concealed or hidden. We commonly use the word to denote that which is above our comprehension or unintelligible. But this is never the meaning of the word in the New Testament. It means there some doctrine or fact which has been concealed, or which has not before been fully revealed, or which has been set forth only by figures and symbols. When the doctrine is made known, it may be as clear and plain as any other. Such was the doctrine that God…”

“Having made known to us - By his word and by his Spirit. The mystery of his will - The gracious scheme of salvation by faith, which depends on his own sovereign will alone. This was but darkly discovered under the law; is now totally hid from unbelievers; and has heights and depths which surpass all the knowledge even of true believers. Ephesians 1:10”

“made: Eph 1:17, Eph 1:18, Eph 3:3-9; Mat 13:11; Rom 16:25-27; Co1 2:10-12; Gal 1:12, Gal 1:16; Col 1:26-28; Ti1 3:16 according: Eph 1:5 purposed: Eph 1:11, Eph 3:11; Job 23:13, Job 23:14; Psa 33:11; Isa 14:24-27, Isa 46:10, Isa 46:11; Jer 2:29; Lam 3:37, Lam 3:38; Act 2:23, Act 4:28, Act 13:48; Rom 8:28; Ti2 1:9 Ephesians 1:10”