Our salvation, is entirely His work. It is by grace, through faith, for every one who believes, to the Jew first and also to the Gentile. There is no difference, for all have sinned and come short of the glory of God. Jew and Gentile alike are condemned in their sin. But God freely imputes Christ's righteousness (for we have no merit of our own), to all who place their faith in Him, who died for our sins and rose again.
In Christ, we have peace with God, for He has removed the wall of sin that separated us from God. In Christ, the barriers that separated us from one another are also torn away. There is one body of Christ, one 'new man', one Spirit, one citizenship, one household, one building.
However, this concept (that all believers {Jews and Gentiles, together} should be one in Christ) is something new, because it was not revealed in the Old Testament. Therefore, Paul devotes chapter 3, to:
But now, to Paul and other NT apostles and prophets (v.3-5), God had made known His purpose that there should be 'one body in Christ.' He made it known "by revelation" {GK=apokalupsis, uncovering}. This same word is used of the future revelation of Jesus Christ (1Pet 1:13; Rev 1:1). Today, His glories are hidden from the unbelieving world, and veiled even to believers. But "when He shall appear... we shall see Him as He is" (1Joh 3:2).
Although the OT prophets spoke of Christ's coming, they struggled to understand, because much remained hidden (1Pet 1:10-12). At His first coming, "the mystery of Christ" was made known by the Holy Spirit (v.5). Since Christ has now fulfilled His work as the suffering servant of God, we understand that "the glory that should follow" belongs to His second coming.
The Spirit revealed to Paul, that Christ's first coming established a new "dispensation of the grace of God" (v.2). The word "dispensation" {GK=oikonomia, stewardship, administration, economy} speaks of God's method of governing His people. In the OT, Israel was governed by the Law of God. In the NT, the Church lives under the Grace of God (eg., Joh 1:17; Rom 6:14; Gal 5:18).
Paul says (v.3) that he wrote "afore {ie., previously}, in few words" about this new economy (the Church of Christ), which includes all believers in one body. He may be thinking of an earlier epistle, which the Ephesians may have read (eg., Rom 16:25,26; 1Cor 2:10,11; Gal 1:12), or, of a preview of the subject earlier in this epistle (Eph 1:6-11). (Paul also touches this subject, in Col 1:24-27, which was written at the same time as Ephesians.)
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