As the gospel spreads throughout the world, this new and variegated Christian community develops. It is as if a great drama is being enacted. History is the theatre, the world is the stage, and church members in every land are the actors. God himself has written the play, and he directs and produces it. Act by act, scene by scene, the story continues to unfold. But who are the audience? They are the cosmic intelligences, the principalities and powers in the heavenly places [Eph. 3:10]. We are to think of them as spectators of the drama of salvation. Thus ‘the history of the Christian church becomes a graduate school for angels.
— John Stott, The Message of Ephesians , 123-124