I think the human race has no future if it doesn't go into space.

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Nothing cannot exist forever.

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Unfortunately, however, these two theories are known to be inconsistent with each other—they cannot both be correct.

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We are very, very small, but we are profoundly capable of very, very big things.

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Disability need not be an obstacle to success.

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We spend a great deal of time studying history, which, let’s face it, is mostly the history of stupidity. So

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We are in danger of destroying ourselves by our greed and stupidity. We cannot remain looking inwards at ourselves on a small and increasingly polluted and overcrowded planet.

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We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.

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Intelligence is the ability to adapt to change.

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Love the neighbor. But don't get caught.

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