Jamieson, Fausset and Brown on Ephesians 2:7

7. Greek, "That He might show forth (middle reflexive voice; for His own glory, Ep 1:6, 12, 14) in the ages which are coming on," that is, the blessed ages of the Gospel which supersede "the age (Greek, for 'course') of this world" (Ep 2:2), and the past "ages" from which the mystery was hidden (Col 1:26, 27). These good ages, though beginning with the first preaching of the Gospel, and thenceforth continually succeeding one another, are not consummated till the Lord's coming again (compare Ep 1:21; He 6:5). The words, "coming on," do not exclude the time then present, but imply simply the ages following upon Christ's "raising them up together" spiritually (Ep 2:6).

kindness--"benignity."

through Christ--rather, as Greek, "in Christ"; the same expression as is so often repeated, to mark that all our blessings center "IN Him."