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

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If you can't explain something simply, you don't know enough about it.

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Everyone knew it was impossible, until a fool who didn't know came along and did it.

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

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Logic can take you from point A to point B. Imagination can take you wherever you want

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The same thinking that has led you to where you are is not going to lead you to where you want to go.

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Once you stop learning, you start dying

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

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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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