Here is another fine post over at "The Vossed World" which is on my side bar: http://breusswane.blogspot.com/2008/08/be-who-you-already-are.html
The relationship between the "indicative" and the "imperative" is crucial to understanding how we are live our lives as Christians. The book recommendation looks very promising. I encourage you to spend some time at The Vossed World--very good stuff!!