Concluded In Unbelief:
The Mystery of One New Man
According to Paul, the mystery of the Gospel--past the fact of Christ's death and resurrection--centers on the corporate effect Christ's death has on the relationship between Jewish and Non-Jewish people ("gentiles"). A new situation exists between Jews and Gentiles since Christ:
3:3 that by revelation there was made known to me the mystery, as I wrote before in brief. 4 By referring to this, when you read you can understand my insight into the mystery of Christ, 5 which in other generations was not made known to the sons of men, as it has now been revealed to His holy apostles and prophets in the Spirit; 6 to be specific, that the Gentiles are fellow heirs and fellow members of the body,
2:14 For He Himself is our peace, who made both groups into one and broke down the barrier of the dividing wall, 15 by abolishing in His flesh the enmity, which is the Law of commandments contained in ordinances, so that in Himself He might make the two into one new man, thus establishing peace, 16 and might reconcile them both in one body to God through the cross, by it having put to death the enmity. 17 And He came and preached peace to you who were far away, and peace to those who were near; 18 for through Him we both have our access in one Spirit to the Father. 19 So then you are no longer strangers and aliens, but you are fellow citizens with the saints, and are of God's household, 20 having been built on the foundation of the apostles and prophets, Christ Jesus Himself being the corner stone. (same as "root" in Rom. 11)
In a nutshell, Paul gives us the heart of the New Testament gospel as it relates to corporate mankind. Everything he goes on to say about "one faith, one baptism, one Lord" is centered on this revelation. Here, at the end of his life, Paul sums everything he's been trying to tell the churches since he first wrote the Galatians, his earliest letter. It's the message for which he was first set apart by God, over which he has suffered so much and why he is in prison even now.
If this mystery is so central to Paul, if it encapsulates what he has lived to communicate for half a generation to the point of endless sufferings and finally death, and if God left Paul's record of this as the backbone of the New Covenant writings for two thousand years, there is a reason for it! Equally true, the enemy of the one true body of Christ must have great stake in seeing to it that the Gentile age never gets the mystery straight!
Lets turn to see what's at the vital core of this New Covenant mystery and how the enemy has sought to blind us to it.