Having made known unto us the mystery of his will, according to his good pleasure which he hath purposed in himself:
Which He 'made to abound toward us' (Ephesians 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 (cf. Ephesians 3:4; Ephesians 3:9; Ephesians 6:19; Romans 16:25; Colossians 1:26-27). This "mystery" is not like the pagan mysteries, imparted only to the initiated few. All Christians are the initiated. Unbelievers alone are the uninitiated.
According to his good pleasure - the cause why He "made known unto us the mystery" - namely, His own loving "good pleasure" toward us; the time and manner of His doing so are also according to His good pleasure.
Purposed (Ephesians 1:11 ) in himself - God the Father. Bengel, 'in Him,' i:e., Christ, as Ephesians 1:3-4. But "in Christ," Ephesians 1:10, immediately after, is inconsistent with His being here meant by the pronoun.