As I worked on this book, I puzzled where core values fit into the research findings. To be clear, there is no single unified set of core values across all the people in this study. That said, each person developed a set of values somewhere along the way, some more explicitly than others. These values might have come from family, or mentors, or teachers, or military service, or the ethics of their field, or the social milieu in which they lived, or their faith traditions, or reading and reflection, or personal experience, or some combination. I came to see that living to a set of core values is a choice, a personal responsibility of the highest order.