A good metaphor is something even the police should keep an eye on.

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First there is a time when we believe everything, then for a little while we believe with discrimination, then we believe nothing whatever, and then we believe everything again - and, moreover, give reasons why we believe.

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So-called professional mathematicians have, in their reliance on the relative incapacity of the rest of mankind, acquired for themselves a reputation for profundity very similar to the reputation for sanctity possessed by theologians.

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Do we write books so that they shall merely be read? Don't we also write them for employment in the household? For one that is read from start to finish, thousands are leafed through, other thousands lie motionless, others are jammed against mouseholes, thrown at rats, others are stood on, sat on, drummed on, have gingerbread baked on them or are used to light pipes.

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With a pen in my hand I have successfully stormed bulwarks from which others armed with sword and excommunication have been repulsed.

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Some theories are good for nothing except to be argued about.

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To be content with life -- or to live merrily, rather --all that is required is that we bestow on all things only a fleeting, superficial glance; the more thoughtful we become the more earnest we grow.

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Even truth needs to be clad in new garments if it is to appeal to a new age.

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It is no great art to say something briefly when, like Tacitus, one has something to say; when one has nothing to say, however, and none the less writes a whole book and makes truth into a liar -- that I call an achievement.

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If moderation is a fault, then indifference is a crime.

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He was always smoothing and polishing himself, and in the end he became blunt before he was sharp.

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Food probably has a very great influence on the condition of men. Wine exercises a more visible influence, food does it more slowly but perhaps just as surely. Who knows if a well-prepared soup was not responsible for the pneumatic pump or a poor one for a war?

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Delight at having understood a very abstract and obscure system leads most people to believe in the truth of what it demonstrates.

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It is hardly to be believed how spiritual reflections when mixed with a little physics can hold people's attention and give them a livelier idea of God than do the often ill-applied examples of his wrath.

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There is no greater impediment to progress in the sciences than the desire to see it take place too quickly.

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What most clearly characterizes true freedom and its true employment is its misemployment.

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One is rarely an impulsive innovator after the age of sixty, but one can still be a very fine orderly and inventive thinker. One rarely procreates children at that age, but one is all the more skilled at educating those who have already been procreated, and education is procreation of another kind.

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The most perfect ape cannot draw an ape; only man can do that; but, likewise, only man regards the ability to do this as a sign of superiority.

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The journalists have constructed for themselves a little wooden chapel, which they also call the Temple of Fame, in which they put up and take down portraits all day long and make such a hammering you can't hear yourself speak.

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Astronomy is perhaps the science whose discoveries owe least to chance, in which human understanding appears in its whole magnitude, and through which man can best learn how small he is.

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Man is a masterpiece of creation if for no other reason than that, all the weight of evidence for determinism notwithstanding, he believes he has free will.

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Actual aristocracy cannot be abolished by any law: all the law can do is decree how it is to be imparted and who is to acquire it.

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Be wary of passing the judgment: obscure. To find something obscure poses no difficulty: elephants and poodles find many things obscure.

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If you are going to build something in the air it is always better to build castles than houses of cards.

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Erudition can produce foliage without bearing fruit.

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Man is always partial and is quite right to be. Even impartiality is partial.

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The noble simplicity in the works of nature only too often originates in the noble shortsightedness of him who observes it.

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Man is a gregarious animal and much more so in his mind than in his body. A golden rule; judge men not by their opinions but by what their opinions have made of them.

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There are very many people who read simply to prevent themselves from thinking.

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There are people who possess not so much genius as a certain talent for perceiving the desires of the century, or even of the decade, before it has done so itself.

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