“Hauing made knowen vnto vs the mysterie of his will, according to his good pleasure, which he had purposed in himselfe,”
1611 King James Version (KJV)
1:9 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.
Eph 1:9 Having made known unto us. To all who receive the adoption of Christ. The mystery of his will. The word "mystery" is used in the sense of something beyond human comprehension until revealed. This "mystery of his will" is revealed and is declared in Eph 1:10. According to his good pleasure. See PNT "Eph 1:5.