The mystery proclaimed by the apostles includes New Jerusalem. Colossians 2:2 tells us that the mystery of God is Christ. The mystery of God is God embodied in Christ to become a God-man who lived among men, died to redeem all men, and rose to impart eternal life into His believers.
However, the mystery of God is not only Christ Himself, but also Christ in us, as in Colossians 1:27, “the riches of the glory of this mystery among the Gentiles, which is Christ in you, the hope of glory.” This Christ is our hope of glory, the glory that will be fully manifested in New Jerusalem.
God made this mystery known to Paul (Eph. 3:3) because God’s good pleasure is that we all see and enter into this mystery (Eph. 1:9). Therefore, Paul’s ministry was “to enlighten all that they may see what the economy of the mystery is, which throughout the ages has been hidden in God” (Eph. 3:9).
First Timothy 3:15 says, “great is the mystery of godliness.” This is God incarnated in Christ. It is also Christ entering into us to be our life, to be manifested through us now and much more in eternity.
Ephesians 3:4 and Colossians 4:3 speak of the mystery of Christ. And Ephesians 5, presenting husband and wife as a portrait of Christ and the church, says, “This mystery is great, but I speak with regard to Christ and the church” (v. 32).
The mystery of God is Christ, God manifested in flesh. It is also Christ in us, people who were merely flesh until we believed into Him and received His eternal life. This life produces the mystery of Christ, all His believers as members of His one Body. So, God in Christ in the believers to form His mystical Body is the great mystery. Eventually His Body consummates in New Jerusalem.
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