Perhaps you are a lifelong Christian as is the author, John A. Cooper. Perhaps you are thinking, ""I have already let God into my life and my salvation is assured."" Perhaps you are not a Christian, maybe you are Muslim, or atheist, or maintain another belief system, or no system at all. Then, this book is for you Even if you have a relationship with God, would you open the door to your heart even wider and give up everything to live only in the...