Introduction Now, well into the 21st century, humans have accomplished incredible innovation. We sent men to the moon and developed immunizations to guard against disease. Incredibly powerful, increasingly compact technol- ogy can fit in a smartphone or a watch. Yet, despite this knowledge and how well we apply it, we still lack self-understanding. We have yet to understand why the divorce rate is high, or why one depressed person goes to bed and shuts the world out while another goes and commits mass hom icide. We use legal and illicit drugs to reduce anxiety and turmoil. Many of our internal and external conflicts result in emotional illnesses, soaring divorce rates, and damaged family structures. These are just a few factors that suggest life is stressful and difficult to manage. It seems ironic that the luxuries of modern life often come with overwhelming emotional and interpersonal tensions. New insight into human behavior is rare. New insight into human understanding is even more rare. This book presents both. If you are like most people, you have, at times, questioned your under- standing of yourself and your behavior and have had frustrating relation- ships. If you are a parent, you may have scratched your head and wondered how your children could be so different from you. You may be confused about why you are attracted to people who are distant or abusive. You may wonder why you have been divorced. What went wrong? Everything seemed so good at the beginning of the relationship. If you’ve been mar- ried more than once, you may wonder why your spouses share similari- ties. You are not alone. These relationship difficulties are nothing to be ashamed of. The ways we relate to each other have changed little over time. The ear- liest written literature shows people behaving in many of the same ways