I used this book as a mentoring tool 20 years ago and am now considering it for a Bible study at church. It is concisely written with a major truth about God and prayer taught by the example of a different Bible hero in each chapter, for a total of 15 truths. The study guide at the end of each chapter enables deeper study by having you looking up cross-reference Scriptures as well as provides excellent discussion and application questions. This study will prompt you to evaluate your prayer life sitting at the feet of the Master as you study men and women who faced challenges similar to your own.