I love this quote Tony Reinke put together from Kevin Vanhoozer's message at the 2013 Desiring God National Conference.
Let me state, in my own terms, what I think I’ve learned from Lewis.
Theology ministers understanding, so that we can live out our knowledge of God. Theology is practical, it is all about waking up to the real, to what is, specifically to what is ‘in Christ.’ For Christ is the meaning of the whole, the one in whom all things are held together.
And disciples demonstrate understanding by conforming to that what is ‘in Christ.’ It’s all about living out our knowledge of Christ. There are no armchair disciples. You cannot be a disciple in theory. So doctrines tell us what is ‘in Christ’ and that’s what we live by.
What is ‘in Christ?’
Incarnation, Trinity, atonement are not abstractions to be thought but meaningful patterns to be lived and entered into. The imagination, then, helps disciples act out what is ‘in Christ.’ Theology exchanges the false pictures that hold us captive with truth, disciplining our imaginations with sound doctrine.
Discipleship is a matter of the indoctrinated imagination.
Now, of course, we have to beware of having our imaginations taken captive by other things. Many of Screwtape’s things have to do with capturing the imagination for Satan’s purposes. If you control the metaphors and stories people live by, you’ve got them.
Imagination is where God gives creative form to his thoughts, and literary forms to his word. Jesus used what we could call the ‘parabolic imagination’ to give story form to his thought about the kingdom of God. And similarly, disciples need this ‘parabolic imagination’ so we can live in that kingdom of God “on earth as it is in heaven.”
Jesus doesn’t describe what the kingdom looks like, he tells us what kinds of things happen there. The metaphors the disciples live by are those that awaken them to the kingdom things God is doing ‘in Christ.’