What is the mystery of the gospel?

The mystery of the gospel is that God predestined to unite all believers, irrespective of their background, into one body under Christ. Paul describes this mystery in Ephesians 3:6, emphasizing that through the gospel, both Jews and Gentiles are made partakers in the promises of God. This revelation challenges the existing divisions and highlights God's sovereign plan to redeem a diverse people through faith in Jesus. The mystery, now revealed, showcases God's inclusive grace, affirming that anyone who believes is accepted into His family.