This is a study of fasting and desire for God. Piper takes the principles of fasting from the Old Testament and weaves them together with the teaching on fasting in the New Testament. This book answers a lot of questions about the why’s of fasting. He enumerates the blessings of it and sounds many needed warnings also.

I recommend this book to get a better grasp of this subject. The chapter on Isaiah 58 is convicting and clarifying. There are practical implications for all believers. I believe every Christian should find it helpful.