I like the introduction to Acts in The Message:
Because the story of Jesus is so impressive – God among us! God speaking in a language we can understand! God acting in ways that heal and help and save us! – there is a danger that we will be impressed, but only be impressed.
As the spectacular dimensions of this story slowly (or suddenly) dawn upon us, we could easily become enthusiastic spectators, and then let it go at that – become admirers of Jesus, generous with our oohs and ahs, and in our better moments inspired to imitate him.
It is Luke’s task to prevent that, to prevent us from becoming mere spectators to Jesus, fans of the Message. Of the original quartet of writers on Jesus, Luke alone continues to tell the story as the apostles and disciples live it into the next generation. The remarkable thing is that it continues to be essentially the same story. Luke continues his narration with hardly a break, a pause perhaps to dip his pen in the inkwell, writing in the same style, using the same vocabulary.
The story of Jesus doesn’t end with Jesus. It continues in the lives of those who believe in him. The supernatural does not stop with Jesus. Luke makes it clear that these Christians he wrote about were no more spectators of Jesus that Jesus was a spectator of God – they are IN on the action of God, God acting IN them, God living IN them. Which also means, of course, in US.