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Wisdom is not a product of schooling but of the lifelong attempt to acquire it.

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

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If one tries to navigate unknown waters one runs the risk of shipwreck

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the real purpose of socialism is precisely to overcome and advance beyond the predatory phase of human development

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A hundred times every day I remind myself that my inner and outer life depend on the labours of other men living and dead and that I must exert myse...more

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Great spirits have always encountered opposition from mediocre minds. The mediocre mind is incapable of understanding the man who refuses to bow blind...more

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Any fool can know. The point is to understand.

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I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

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It is not that I'm so smart. But I stay with the questions much longer.

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The measure of intelligence is the ability to change.

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No amount of experimentation can ever prove me right a single experiment can prove me wrong.

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I think and think for months and years. Ninety-nine times the conclusion is false. The hundredth time I am right

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It is the theory which decided what can be observed.

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E = MC^2: Energy equals mass times the speed of light squared.

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As far as the laws of Mathematics refer to reality they are not certain and as far as they are certain they do not refer to reality.