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This only is certain, that there is nothing certain; and nothing more miserable and yet more arrogant than man.

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The beginning of wisdom is found in doubting; by doubting we come to the question, and by seeking we may come upon the truth.

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There are in fact two things, science and opinion; the former begets knowledge, the latter ignorance.

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Most institutions demand unqualified faith; but the institution of science makes skepticism a virtue.

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Philosophy consists very largely of one philosopher arguing that all others are jackasses. He usually proves it, and I should add that he also usually proves that he is one himself.

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Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.

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Science is the record of dead religions.

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Shoot for the moon. Even if you miss it you will land among the stars.

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Black holes are where God divided by zero.

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What happens if a big asteroid hits Earth ? Judging from realistic simulations involving a sledge hammer and a common laboratory frog, we can assume it will be pretty bad.

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