By the time Harold was in his mid-twenties, he was well on his way toward a happy and fulfilling life, and the building blocks of his happiness had little to do with the lines on his résumé. There’s a debate in our culture about what really makes us happy, which is summarized by, on the one hand, the book “On the Road” and, on the other, the movie “It’s a Wonderful Life.” The former celebrates the life of freedom and adventure. The latter celebrates roots and connections. Research over the past thirty years makes it clear that what the inner mind really wants is connection. “It’s a Wonderful Life” was right. Joining a group that meets just once a month produces the same increase in happiness as doubling your income. According to research by Daniel Kahneman, Alan B. Krueger, and others, the daily activities most closely associated with happiness are social—having sex, socializing after work, and having dinner with friends. Many of the professions that correlate most closely with happiness are also social—a corporate manager, a hairdresser.