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Money only appeals to selfishness and always tempts its owners irresistibly to abuse it. Can anyone imagine Moses, Jesus, or Gandhi armed with the money-bags of Carnegie?
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The most important tool of the theoretical physicist is his wastebasket.
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The attempt to combine wisdom and power has only rarely been successful, and then only for a short while.
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The more success the quantum theory has, the sillier it looks.
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The only rational way of educating is to be an example. If one can't help it, a warning example.
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Gradually the conviction gained recognition that all knowledge about things is exclusively a working-over of the raw material furnished by the senses. ... Galileo and Hume first upheld this principle with full clarity and decisiveness.
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An expert is a person who has few new ideas; a beginner is a person with many.
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If I had an hour to solve a problem and my life depended on the solution, I would spend the first 55 minutes determining the proper question to ask, for once I know the proper question, I could solve the problem in less than five minutes.
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About Newton: Nature to him was an open book, whose letters he could read without effort.
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Wait a minute! I am not a mystic. Trying to find out the laws of nature has nothing to do with mysticism, though in the face of creation I feel very humble. It is as if a spirit is manifest infinitely superior to man's spirit. Through my pursuit in science I have known cosmic religious feelings. But I don't care to be called a mystic.
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What I particularly admire in him is the firm stand he has taken, not only against the oppressors of his countrymen, but also against those opportunists who are always ready to compromise with the Devil. He perceives very clearly that the world is in greater peril from those who tolerate or encourage evil than from those who actually commit it.
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The economic anarchy of capitalist society as it exists today is, in my opinion, the real source of evil.
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I refuse to engage in an intellectual battle with an unarmed man.
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Stupidity is a personal achievement which transcends national boundaries.
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I am a determinist. As such, I do not believe in free will. The Jews believe in free will. They believe that man shapes his own life. I reject that doctrine philosophically. In that respect I am not a Jew.
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If I were to remain silent, I'd be guilty of complicity.
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When the number of factors coming into play in a phenomenological complex is too large scientific method in most cases fails. One need only think of the weather, in which case the prediction even for a few days ahead is impossible.
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Dimensionless constants in the laws of nature, which from the purely logical point of view can just as well have different values, should not exist.
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I now see the necessity of a beginning.
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How can it be that mathematics, being after all a product of human thought which is independent of experience, is so admirably appropriate to the objects of reality? Is human reason, then, without experience, merely by taking thought, able to fathom the properties of real things?
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A man's ethical behaviour should be based effectually on sympathy, education, and social ties and needs; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.
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Ethical axioms are founded and tested not very differently from the axioms of science. Truth is what stands the test of experience.
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The legs are the wheels of creativity.
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As far as I'm concerned I prefer silent vice to ostentatious virtue.