As people strengthened their willpower muscles in one part of their lives—in the gym, or a money management program—that strength spilled over into what they ate or how hard they worked. Once willpower became stronger, it touched everything.

The cooperation of NASCAR - or any other system, it turns out - persists only when everyone believes he has the opportunity to win.

There's a natural instinct embedded in friendship, a sympathy that makes us willing to fight for someone we like when they are treated unjustly.

Champions don’t do extraordinary things. They do ordinary things, but they do them without thinking, too fast for the orther team to react. They follow the habits they’ve learned.

Belief is easier when it occurs within a community.

The problem is that your brain can't tell the difference between bad and good habits, and so if you have a bad one, it's always lurking there, waiting for the right cues and rewards.

Some say because music is as much about personal expression as listening pleasure, sharing is integral to why songs have value in the first place.