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What is significant in one's own existence one is hardly aware, and it certainly should not bother the other fellow. What does a fish know about the water in which he swims all his life?
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The truth of a theory is in your mind, not in your eyes.
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To understand the world one must not be worrying about one's self.
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Gravitation cannot be held responsible for people falling in love. How on earth can you explain in terms of chemistry and physics so important a biological phenomenon as first love? Put your hand on a stove for a minute and it seems like an hour. Sit with that special girl for an hour and it seems like a minute. That's relativity.
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Compound interest is the eighth wonder of the world. He who understands it, earns it ... he who doesn't ... pays it.
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The greatest knowledge a person can possess is the address of the local library.
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There is possibility in every difficulty.
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What is essential in the life of a man of my kind is what he thinks and how he thinks, and not what he does or suffers.
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For an idea which, at first, does not seem absurd, there is no hope.
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True knowledge comes with deep understanding of a topic and its inner workings.
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I'm not a genius. I'm just passionately curious.
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This subject brings me to that vilest offspring of the herd mind - the odious militia. The man who enjoys marching in line and file to the strains of music falls below my contempt; he received his great brain by mistake - the spinal cord would have been amply sufficient. This heroism at command, this senseless violence, this accursed bombast of patriotism - how intensely I despise them! War is low and despicable, and I had rather be smitten to shreds than participate in such doings.
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Time is an illusion.
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If you're not sure why you're doing something, you can never do enough of it. Imagination is more important than knowledge.
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Arrows of hate have been aimed at me too, but they have never hit me, because somehow they belonged to another world with which I have no connection whatsoever.
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I have faith in the universe, for it is rational. Law underlies each happening. And I have faith in my purpose here on earth. I have faith in my intuition, the language of my conscience, but I have no faith in speculation about Heaven and Hell. I'm concerned with this time-here and now.
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A human being is part of a whole called by us the universe.
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The finest emotion of which we are capable is the mystic emotion. Herein lies the germ of all art and all true science. Anyone to whom this feeling is alien, who is no longer capable of wonderment and lives in a state of fear is a dead man.
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Man tries to make for himself in the fashion that suits him best a simplified and intelligible picture of the world; he then tries to some extent to substitute this cosmos of his for the world of experience, and thus to overcome it. This is what the painter, the poet, the speculative philosopher, and the natural scientists do, each in his own fashion. Each makes this cosmos and its construction the pivot of his emotional life, in order to find in this way peace and security which he can not find in the narrow whirlpool of personal experience.
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Live with purpose. Don't let people or things around you get you down.
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In the matter of physics, the first lessons should contain nothing but what is experimental and interesting to see. A pretty experiment is in itself often more valuable than twenty formulae extracted from our minds.
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I believe that whatever we do or live for has its causality; it is good, however, that we cannot see through to it.
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It is impossible to get out of a problem by using the same kind of thinking that it took to get into it.
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Combinatory play seems to be the essential feature in productive thought - before there is any connection with logical construction in words or other kinds of signs which can be communicated to others.