Ephesians 3:1-4

For this reason [because I preach that you and believing Jews are joint heirs] I, Paul, am the prisoner of Christ Jesus on behalf of you Gentiles— assuming that you have heard of the stewardship of God’s grace that was entrusted to me [to share with you] for your benefit; and that by [divine] revelation the mystery was made known to me, as I have already written in brief. [Eph 1:9] By referring to this, when you read it you can understand my insight into the mystery of Christ