Reading this book and applying the Biblical guidelines for fasting will help you obtain the greatest benefits from fasting, both spiritual and physical. Journal Edition Jesus did not say "If you fast.." but rather "When you fast.." As you read best-selling author Derek Prince's biblical teaching on fasting, you will discover answers to such questions as: Why should I fast? What happens during a fast? What are the rewards of fasting? How long should I fast? How should I break a fast?