When the seventh angel sounds, Christ receives the "kingdoms of this world," in Revelation 11:15. What is the mystery?  It’s "Christ in you." Paul wrote, “To whom God would make known what [is] the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory” (Colossians 1:27). The mystery is having Christ in His people, but it seems strange that in Revelation just before the seventh trumpet we would begin to have Jesus living in us.