content: Our pastor was doing a series of sermons based on this book. We were not required to purchase the book. I am so glad I did. The book contained more information about angels than I had ever expected. The content was based on Holy Scripture (The Bible) and cited references. Reading this book inspired me to read more books on angels. This was the first book I had read written by Billy Graham. I had no idea what a great author he was. I have since ordered other books by Billy Graham and am pleased with them all.