Paul confirms his earlier statements of unity between Israel and gentiles in this chapter, and his role in announcing this situation, and encouraging gentiles to join in.
4 In reading this, then, you will be able to understand my insight into the mystery of Christ, 5 which was not made known to people in other generations as it has now been revealed by the Spirit to God’s holy apostles and prophets. 6 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.
Ephesians 3:4-6 NIV
When you read that we are “sharers together in the promise in Christ Jesus” what do you think of?