"We've made leadership about changing the world. And there is no world. There's only 7 billion understandings of it. And if you change one person's understanding of what they're capable of, one person's understanding of how much people care about them, one person's understanding of how powerful an agent for change they can be in this world, you've changed the whole thing. If we can understand leadership like that, if we can define leadership like that, I think we can change everything."