Administration of mystery of God's grace

Ephesians 3:1-11
Administration of God's grace that was given to me for gentile.
Administration of this mystery, which for ages past was kept hidden in God.
This mystery is that through the gospel the Gentiles are heirs together with Israel, members together of one body, and shares together in the promise in Christ Jesus.
God's intent was that now, through the church, the manifold wisdom of God should be made known to the rulers and authorities in the heavenly realms.
Why?
Before Christ came, God's promises were largely confined to the Jews. The gospel of Christ was itself largely a 'mystery', 'kept secret' until now - and at the heart of this secret was God's intention to make the gentiles, too, heirs to all his promises.
When Paul was commissioned to bring them the message of salvation, a new phase in God's plan was begun.
As people of all nations are brought together in Christ they demonstrate God's power and wisdom, not only to the watching world, but to the cosmic powers beyond and behind it.
Paul knew the mystery of gospel, so he devoted his life to preach message to Gentiles.
The church is the manifold wisdom of God, be made known to the rulers and authorities in the heavenly realms. Church is the symbol of ambassador of  heavenly realm in this world.
All Christians are together of one body of Christ and share together in the promise in Christ. All in one in Holy Spirit as one body, one family.
How?
Love each other among brothers, let people know we are belong to the Lord.
Preach the mystery of gospel, even many won't accept it, until end of that Day.
Blessing are those who believed in Jesus Christ.