Those who manage their way into a crisis are not necessarily the right people to manage their way out of a crisis

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What you can't imagine, you can't discover.

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I don't need to know everything, I just need to know where to find it, when I need it

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Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

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The only sure way to avoid making mistakes is to have no new ideas.

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

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Thinking is hard work; that's why so few do it.

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Great spirits have always encountered opposition from mediocre minds. The mediocre mind is incapable of understanding the man who refuses to bow blindly to conventional prejudices and chooses instead to express his opinions courageously and honestly.

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Don't listen to the person who has the answers; listen to the person who has the questions.

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I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

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