 It's really a form of impulse control, resisting your immediate urges and unproductive emotions like anger, jealousy, and fear, so you can achieve the calm self-mastery that makes us productive and self-possessed citizens. And then I set out to see how the founders applied these lessons in their own lives. And again, what I learned came as a revelation. They talked constantly about their efforts to achieve virtuous self-mastery, to calm their anxieties.