Recently we gathered a group of 32 Pentecostal leaders in the Northwest for a weekend over the concept of "creating a culture of prayer." This was our pre-retreat read. Simple, refreshing and written almost as a devotion to spur the Spirit led saint on. Bought an extra 5 for my church staff too.
This is an amazingly great book that is both practical and thought provoking. It will take you to depths of your being that you may have forgotten existed. The author was careful not to manipulate your thoughts; but instead created questions and exercises that will require you to search out scriptures to find the answers. I recommend this book to every person that desires a closer walk with God.