If this was purely the dream of the man called Paul, then he could write novels or dramas such as no Dickens or Shakespeare ever came close to.
But it was not the dream of Paul; it was the dream of Father God.
To create in Himself one new man from the two, thus making peace, and that He might reconcile them both to God in one body through the cross, thereby putting to death the enmity. (Ephesians 2:15–16)
There was enmity between the Jew under the law and the gentile without the law.
Now that enmity is slain, when the Jew and the gentile are born again, both come into the body of Christ, where they are one new man.
This new creation teaching is the master piece of God.
Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new. Now all things are of God, who has reconciled us to Himself through Jesus Christ, and has given us the ministry of reconciliation. (2 Corinthians 5:17–18)
If God had simply forgiven man for what he had done, and did nothing more, man would continue to commit sin.
But God does not forgive the sinner. He makes him a new creation out of them. He remits and wipes out all that the sinner has ever done. He stops a man being a sinner and makes him a saint by the new creation.
He imparts to them His own nature. Old things pass away. All things become new in Christ.
And put on the new man, that after God hath been created in righteousness and holiness of truth. (Ephesians 4:24 ASV)
Put on (endúō) this is in the past tense revering to legal redemption, it means to put on who we already are in Christ.
Put on means- to put on as a garment. But this kind of garment penetrates our soul, transforming it. Our will, thoughts, feelings, imagination, are filled with the Spirit changing the way we behave, how we present ourselves in the world.
This new creation is made from righteousness, so we are the embodiment of righteousness.
The new creation is made from holiness, so we manifest the very holiness of God.
The new creation is made from truth, so we have the ability to speak the truth and set the captive free.
The Father unveils His very genius in this new birth.
We are the workmanship of God in Christ Jesus.