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If a man wants to read good books, he must make a point of avoiding bad ones; for life is short, and time and energy limited.
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The method of viewing things which proceeds in accordance with the principle of sufficient reason is the rational method, and it alone is valid and of use in practical life and in science. The method which looks away from the content of this principle is the method of genius, which is only valid and of use in art.
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That arithmetic is the basest of all mental activities is proved by the fact that it is the only one that can be accomplished by a machine.
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Descartes is rightly regarded as the father of modern philosophy primarily and generally because he helped the faculty of reason to stand on its own feet by teaching men to use their brains in place whereof the Bible, on the one hand, and Aristotle, on the other, had previously served.
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The faculty for remembering is not diminished in proportion to what one has learnt, just as little as the number of moulds in which you cast sand lessens its capacity for being cast in new moulds.
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Ueberhaupt aber bin ich allmälig der Meinung geworden, daß der erwähnte Nutzen der Kathederphilosophie von dem Nachtheil überwogen werde, den die Philosophie als Profession der Philosophie als freier Wahrheitsforschung, oder die Philosophie im Auftrage der Regierung der Philosophie im Auftrage der Natur und der Menschheit bringt.
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If you want to know your true opinion of someone, watch the effect produced in you by the first sight of a letter from him.
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A man's delight in looking forward to and hoping for some particular satisfaction is a part of the pleasure flowing out of it, enjoyed in advance. But this is afterward deducted, for the more we look forward to anything the less we enjoy it when it comes.
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It is difficult, if not impossible, to define the limit of our reasonable desires in respect of possessions.
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Dissimulation is innate in woman, and almost as much a quality of the stupid as of the clever.
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It is a clear gain to sacrifice pleasure in order to avoid pain.
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Just remember, once you're over the hill you begin to pick up speed.
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I observed once to Goethe that when a friend is with us we do not think the same of him as when he is away. He replied, "Yes! because the absent friend is yourself, and he exists only in your head; whereas the friend who is present has an individuality of his own, and moves according to laws of his own, which cannot always be in accordance with those which you form for yourself.
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Any foolish boy can stamp on a beetle, but all the professors in the world cannot make a beetle.
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We may divide thinkers into those who think for themselves and those who think through others. The latter are the rule and the former the exception. The first are original thinkers in a double sense, and egotists in the noblest meaning of the word.
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Childish and altogether ludicrous is what you yourself are and all philosophers; and if a grown-up man like me spends fifteen minutes with fools of this kind, it is merely a way of passing the time. I've now got more important things to do. Goodbye!
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Scholars are those who have read in books, but thinkers, men of genius, world-enlighteners, and reformers of the human race are those who have read directly in the book of the world.
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Hatred comes from the heart; contempt from the head; and neither feeling is quite within our control.
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In every page of David Hume, there is more to be learned than from Hegel's, Herbart's and Schleiermacher's complete philosophical works. - vol. II, p. 582 (as cited on p. 177 of Schopenhauer: A Biography)
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If you feel irritated by the absurd remarks of two people whose conversation you happen to overhear, you should imagine that you are listening to a dialogue of two fools in a comedy.
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My body and my will are one.
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The problem with Germans is that they look in the clouds for what lies at their feet.
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At the age of five years to enter a spinning-cotton or other factory, and from that time forth to sit there daily, first ten, then twelve, and ultimately fourteen hours, performing the same mechanical labour, is to purchase dearly the satisfaction of drawing breath. But this is the fate of millions, and that of millions more is analogous to it.
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Every man takes the limits of his own field of vision for the limits of the world.