If we have no heretics we must invent them, for heresy is essential to health and growth.

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The most agonising thing is to drop doubt into a man about his being a reality, three-dimensional - and not some other kind of reality.

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There are books of the same chemical composition as dynamite. The only difference is that a piece of dynamite explodes once, whereas a book explodes a thousand times.

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We need writers who fear nothing. ("Our Goal")

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Children are the boldest philosophers. They enter life naked, not covered by the smallest fig leaf of dogma, absolutes, creeds. This is why every question they ask is so absurdly naïve and so frighteningly complex.

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Explosions are not comfortable.

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The only means of ridding man of crime is ridding him of freedom.

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Children are the only brave philosophers. And brave philosophers are, inevitably, children.

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There is an excellent way to make predictions without the slightest risk of error: predict the past.

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I prefer being wrong in my own way to being right in someone else's.

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