How do the Gentiles become fellow heirs and partakers of the promise in Christ?
Gentiles become fellow heirs and partakers of the promise in Christ through the Gospel, not by the law and not by works. That one Gospel is that Christ died, was buried, and rose from the dead. As members of His Body, believers are joint heirs with Him, part and parcel of Him.
Les explains that Paul’s ministry is such that the Gentiles should be fellow heirs, of the same body, and partakers of His promise in Christ. This is not by the law, not by works, but by the Gospel. Paul only knows one Gospel: Christ died, was buried, and rose from the dead. Because members of the Body are joint heirs with Him and part and parcel of Him—He is the Head and we are the Body—their relationship is far different from that of subjects under a King.