When you hear the word mystery, what comes to mind? Do you think of something esoteric and incomprehensible, or do you think of a whodunit crime novel? For Paul in Ephesians 3, mystery means something that God had not previously made known or made clear but has now revealed. We could not arrive at this mystery by reason or observation alone. The good mystery was revealed by God.
God’s plan was progressively revealed. We see a hint of it in the curse on the Serpent in Genesis 3:15 and in the promises to Abraham and David. The prophecies of the Old Testament point to it. But the mystery was not fully revealed until it was revealed to the apostles and prophets (Ephesians 3:5). Yes, the mystery when revealed was a bit of a shock to some Jews. But Paul assures us: the good mystery was revealed to the apostles and prophets.
What is this good mystery? It is that the Gentiles are fellow heirs, fellow members of the same body, and fellow partakers of the promise in Christ Jesus through the gospel (Ephesians 3:6). God’s plan was to create a new humanity in Jesus “from every tribe and language and people and nation.” Everyone can share in the inheritance. Everyone can be a part of the body. Everyone can partake of the promise. The good mystery is that the gospel is for all.
That means the good mystery is preached. Paul became a minister of the gospel “to preach to the Gentiles the unsearchable riches of Christ, and to bring to light for everyone what is the plan of the mystery hidden for ages in God” (Ephesians 3:8-9). Paul makes clear that the church is an integral part of the plan.
… so that through the church the manifold wisdom of God might now be made known to the rulers and authorities in the heavenly places. This was according to the eternal purpose that he has realized in Christ Jesus our Lord … (Ephesians 3:10–11, ESV)
I suspect that we struggle a bit thinking about spiritual beings observing the church to see the wisdom of God. But what they should see is a new humanity in Christ Jesus. They should see is both Jew and Gentile formed into one family of God. They should see people, regardless of nationality, race, culture or language, being united in Christ and transformed into Christ’s likeness.
The good mystery is revealed by God. It has been revealed to the apostles and prophets. We read about it in our New Testaments. The mystery that Paul preached is that the gospel is for all.