“People who don’t know how to summarize have no dignity. Neither do people who needlessly drag on their messy lives. They who don’t know the beauty of simplification, of pruning away the unnecessary, die without ever comprehending the true meaning of life.”

“Every time I think I’m getting smarter I realize that I’ve just done something stupid. Dad says there are three kinds of people in the world: those who don’t know, and don’t know they don’t know; those who don’t know and do know they don’t know; and those who know and know how much they still don’t know.Heavy stuff, I know. I think I’ve finally graduated from the don’t-knows that don’t know to the don’t-knowsthat do.”

“You don’t have to know a lot of things for your life to make a lasting difference in the world. But you do have to know the few great things that matter, perhaps just one, and then be willing to live for them and die for them. The people that make a durable difference in the world are not the people who have mastered many things, but who have been mastered by one great thing.”

“And after a while...I mean how do you choose? Who gets to live? Part of life is that...well, some people have to die.”

“We have a crisis of leadership in America because our overwhelming power and wealth, earned under earlier generations of leaders, made us complacent, and for too long we have been training leaders who only know how to keep the routine going. Who can answer questions, but don’t know how to ask them. Who can fulfill goals, but don’t know how to set them. Who think about how to get things done, but not whether they’re worth doing in the first place. What we have now are the greatest technocrats the world has ever seen, people who have been trained to be incredibly good at one specific thing, but who have no interest in anything beyond their area of exper­tise. What we don’t have are leaders. What we don’t have, in other words, are thinkers. People who can think for themselves. People who can formulate a new direction: for the country, for a corporation or a college, for the Army—a new way of doing things, a new way of looking at things. People, in other words, with vision.”

“But sometimes you have to sacrifice your life for the safety of others, even if you don’t know who those people are.”