Our death is not an end if we can live on in our children and the younger generation. For they are us; our bodies are only wilted leaves on the tree of life.

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When I have one week to solve a seemingly impossible problem, I spend six days defining the problem. Then, the solution becomes obvious.

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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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Persistence is the most powerful force on earth, it can move mountains.

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Most people see what is, and never see what can be.

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Nothing causes more consternation in a group of hypocrits than one honest man.

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

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Be kind to people who are different from you.

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We cannot solve our problems with the same thinking we used when we created them.

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Blind belief in authority is the greatest enemy of truth.

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