“In the long run, completing a marathon makes us happier than eating a chocolate cake. Raising a child makes us happier than beating a video game. Starting a small business with friends while struggling to make ends meet makes us happier than buying a new computer. These activities are stressful, arduous, and often unpleasant. They also require withstanding problem after problem. Yet they are some of the most meaningful moments and joyous things we’ll ever do.”