I believe that water will one day be employed as fuel, that hydrogen and oxygen which constitute it, used singly or together, will furnish an inexhaustible source of heat and light, of an intensity of which coal is not capable.

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Anything you can imagine you can make real.

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It seems wisest to assume the worst from the beginning...and let anything better come as a surprise.

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There are no impossible obstacles; there are just stronger and weaker wills, that’s all!

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Nature's creative power is far beyond man's instinct of destruction.

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Travel enables us to enrich our lives with new experiences, to enjoy and to be educated, to learn respect for foreign cultures, to establish friendships, and above all to contribute to international cooperation and peace throughout the world.

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If there were no thunder, men would have little fear of lightning.

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What darkness to you is light to me.

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All that is impossible remains to be accomplished.

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Science, my lad, is made up of mistakes, but they are mistakes which it is useful to make, because they lead little by little to the truth.

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