Mystery : The Gentiles are heirs together with Israel

Ephesians 3:1-13
This mystery is that through the gospel the Gentiles are heirs together with Israel, members together of one body, and sharers together in the promise in Christ Jesus.
 His 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, according to his eternal purpose that he accomplished in Christ Jesus our Lord.
In him and through faith in him we may approach God with freedom and confidence. I ask you, therefore, not to be discouraged because of my sufferings for you, which are your glory.
Before Christ came, God's promises were largely confined to the Jews. The Old Testament gives only glimpses of his purpose for the wider world.
The gospel of Christ was itself largely a 'mystery',  'kept secret' until now - and at the heart of this secret was God' 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. Through faith in Christ we can be confident of access to God. Since such benefits flow from the spread of the gospel, Paul's readers must not let this present suffering discourage them.
Why?
Paul is prisoner of Christ Jesus for sake of Gentiles. He did good jobs as a servant of the Lord.
In him and through faith in him we may approach God with freedom and confidence. This is a great grace of Jesus Chris gave us. 
God's intention and mystery was revealed and make plain to all people. and made known to the rulers and authorities in the heavenly realms. For God made it known to all. So we can come before the Lord and pray to the Lord.
How?
Thank God and appreciated the effort of what Paul has done, I could be a hair of Jesus Christ.