In this book the author gives a fresh perspective on what the Christian life is meant to look like in today's world and culture. The author is evidently well-read, referring to lots of classical authors on philosophy, culture, and the Christian life. Every chapter kept making me think, "If people could just read this chapter..." Probably the most perceptive and clarifying book I've read in 10 years. Yes, there are several times when the author could say things more concisely, but the truth of what he was saying kept me going.
I actually started this book by reading the appendix, "The Cavalry: On Trumpets and Horses." The author explains that it is easy to cast a vision (a trumpet call), but most of the time there's no one with the strength and substance needed to fulfill that vision. As a church, we don't need inspiration (which leads to a need for validation) as much as we need simple instruction and growth in faith, love, and virtue.
If you are wondering why the Christian life doesn't seem to be working right for you, read this book.