QUOTE : We think that research into willpower and self-control is psychology’s best hope for contributing to human welfare. Willpower lets us change ourselves and our society in small and large ways. As Charles Darwin wrote in The Descent of Man, “The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.” The Victorian notion of willpower would later fall out of favor, with some twentieth-century psychologists and philosophers doubting it even existed. Baumeister himself started out as something of a skeptic. But then he observed willpower in the laboratory: how it gives people the strength to persevere, how they lose self-control as their willpower is depleted, how this mental energy is fueled by the glucose in the body’s bloodstream. He and his collaborators discovered that willpower, like a muscle, becomes fatigued from overuse but can also be strengthened over the long term through exercise. Since Baumeister’s experiments first demonstrated the existence of willpower, it has become one of the most intensively studied topics