Paul, in his letter we know as “To the Ephesians,” reminds them,
that you were at that time separate from Christ, excluded from the commonwealth of Israel, and strangers to the covenants of promise, having no hope and without God in the world.
via Ephesians 2.12 NASB.
This statement is situated in the first half of the letter (chapters 1-3) and is sandwiched by other passages proclaiming a new commonwealth in exchange for the one that excluded Gentiles.
He made known to us the mystery of His will, according to His kind intention which He purposed in Him with a view to an administration suitable to the fullness of the times, that is, the summing up of all things in Christ, things in the heavens and things on the earth.
And then:
By referring to this, when you read you can understand my insight into the mystery of Christ, 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; to be specific, that the Gentiles are fellow heirs and fellow members of the body, and fellow partakers of the promise in Christ Jesus through the gospel, of which I was made a minister, according to the gift of God’s grace which was given to me according to the working of His power. To me, the very least of all saints, this grace was given, to preach to the Gentiles the unfathomable riches of Christ, and to bring to light what is the administration of the mystery which for ages has been hidden in God who created all things; so that the manifold wisdom of God might now be made known through the church to the rulers and the authorities in the heavenly places. This was in accordance with the eternal purpose which He carried out in Christ Jesus our Lord.
In both 1.10 and 3.9 the word “administration” translates oikonomia–more literally: economy
And then the word for “commonwealth” is politeuma related to that word we all know and love: politics.
The Gospel is the declaration of, as well as the means of forming and growing, a new political-economy, a new civilization.