Ephesians 3:3-6

3that is, the mystery made known to me by revelation, as I have already written briefly. 4In reading this, then, you will be able to understand my insight into the mystery of Christ, 5which was not made known to men in other generations as it has now been revealed by the Spirit to God’s holy apostles and prophets. 6This mystery is that through the gospel the Gentiles are fellow heirs, fellow members of the body, and fellow partakers of the promise in Christ Jesus.