The thesis of this book is that the key to a successful, happy life is the fullest possible development of our unlimited potential for love. Much of our energy for love often remains untapped. What is worse, sometimes this same human energy is misdirected and becomes an instrument of hatred, violence, and war. How we can actualize our capabilities for love and how we can extend this energy in a positive direction are delineated. This book shows the value and need for Christians to make full use of the psychological tools which scientific research has given to our generation.