If you want to live a happy life, tie it to a goal, not to people or objects.

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If people are good because they fear punishment, and hope for reward, then we are a sorry lot indeed.

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A clever person solves a problem. A wise person avoids it.

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The only reason for time is so that everything doesn't happen at once.

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I never made one of my discoveries through the process of rational thinking

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There comes a point in your life when you need to stop reading other people's books and write your own.

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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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Once you stop learning, you start dying

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A problem defined, is a problem half solved.

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Strive not to be a success, but rather to be of value.

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