To them God willed to make known what are the riches of the glory of this mystery among the Gentiles: which is Christ in you, the hope of glory.

—Colossians 1:27

Do you ever get involved in a good mystery story, intrigued by the twists and turns, trying to figure it out until, in the final scene, you discover whodunit?

God has revealed one great mystery to us, a mystery which had previously lain hidden for centuries: