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Only a very dull man spells a word the same way twice.
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Lasting harmony with a woman was an undertaking in which I twice failed rather disgracefully.
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The individual must not merely wait and criticize, he must defend the cause the best he can. The fate of the world will be such as the world deserves.
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Some men spend a lifetime in an attempt to comprehend the complexities of women. Others pre-occupy themselves with somewhat simpler tasks, such as understanding the theory of relativity!
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I never failed in mathematics. Before I was fifteen I had mastered differential and integral calculus.
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If I would be a young man again and had to decide how to make my living, I would not try to become a scientist or scholar or teacher. I would rather choose to be a plumber or a peddler in the hope to find that modest degree of independence still available under present circumstances.
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Nuclear power is one hell of a way to boil water.
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Philosophy is like a mother who gave birth to and endowed all the other sciences. Therefore, one should not scorn her in her nakedness and poverty, but should hope, rather, that part of her Don Quixote ideal will live on in her children so that they do not sink into philistinism.
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The contemplation of this world beckoned as a liberation. The road to this paradise was not as comfortable and alluring as the road to the religious paradise; but it has shown itself reliable, and I have never regretted having chosen it.
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It gives me great pleasure, indeed, to see the stubbornness of an incorrigible nonconformist warmly acclaimed.
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In the teaching of geography and history a sympathetic understanding be fostered for the characteristics of the different peoples of the world, especially for those who we are in the habit of describing as primitive.
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Fundamental ideas play the most essential role in forming a physical theory. Books on physics are full of complicated mathematical formulae. But thought and ideas, not formulae, are the beginning of every physical theory. The ideas must later take the mathematical form of a quantitative theory, to make possible the comparison with experiment.
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At the same time, as social beings, we are moved in the relations with our fellow beings by such feelings as sympathy, pride, hate, need for power, pity, and so on.
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War seems to me to be a mean, contemptible thing: I would rather be hacked in pieces than take part in such an abominable business. And yet so high, in spite of everything, is my opinion of the human race that I believe this bogey would have disappeared long ago, had the sound sense of the nations not been systematically corrupted by commercial and political interests acting through the schools and the Press.
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I am neither a German citizen, nor do I believe in anything that can be described as a 'Jewish faith.' But I am a Jew and glad to belong to the Jewish people, though I do not regard it in any way as chosen.
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I always have a high regard for the individual and have an insuperable distaste for violence and clubmanship. All these motives made me into a passionate pacifist and anti-militarist. I am against any nationalism, even in the guise of mere patriotism. Privileges based on position and property have always seemed to me unjust and pernicious, as did any exaggerated personality cult.
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We can invent as many theories we like, and any one of them can be made to fit the facts. But that theory is always preferred which makes the fewest number of assumptions.
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Love is a better teacher than duty.
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One has to realize that the powerful industrial groups concerned in the manufacture of arms are doing their best in all countries to prevent the peaceful settlement of international disputes, and that rulers can achieve this great end only if they are sure of the vigorous support of the majority of their peoples.
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I thought of that while riding my bicycle.
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One has a feeling that one has a kind of home in this timeless community of human beings that strive for truth. … I have always believed that Jesus meant by the Kingdom of God the small group scattered all through time of intellectually and ethically valuable people.
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Freud's sense of reality is less clouded by wishful thinking than is the case with other people and he combines the qualities of critical judgment, earnestness and responsibility.
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There is, fortunately, a minority composed of those who recognize early in their lives that the most beautiful and satisfying experiences open to humankind are not derived from the outside, but are bound up with the development of the individual's own feeling, thinking and acting. The genuine artists, investigators and thinkers have always been persons of this kind. However inconspicuously the life of these individuals runs its course, none the less the fruits of their endeavors are the most valuable contributions which one generation can make to its successors.
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The physicists say that I am a mathematician, and the mathematicians say that I am a physicist. I am a completely isolated man and though everybody knows me, there are very few people who really know me.