If people should ever start to do only what is necessary millions would die of hunger.
One of the greatest creations of the human mind is the art of reviewing books without having read them.
We judge nothing so hastily as character, and yet there is nothing over which we should be more cautious.... I have always found that the so-called bad people improve on closer acquaintance, while the good fall off.
One of the greatest and also the commonest of faults is for men to believe that, because they never hear their shortcomings spoken of, or read about them in cold print, others can have no knowledge of them.
When a book and a head collide and a hollow sound is heard, must it always have come from the book?
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.
Do not say hypothesis, and even less theory: say way of thinking.
The great trick of regarding small departures from the truth as the truth itself - on which is founded the entire integral calculus - is also the basis of our witty speculations, where the whole thing would often collapse if we considered the departures with philosophical rigour.
The sure conviction that we could if we wanted to is the reason so many good minds are idle.
Much reading has brought upon us a learned barbarism.
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.
The thoughts written on the walls of madhouses by their inmates might be worth publicizing.
If you are going to build something in the air it is always better to build castles than houses of cards.
Everyone should study at least enough philosophy and belles-lettres to make his sexual experience more delectable.
It is too bad if you have to do everything upon reflection and can't do anything from early habit.
Man is so perfectable and corruptible he can become a fool through good sense.
What a blessing it would be if we could open and shut our ears...as easily as we open and shut our eyes.
Knowledge acquired too rapidly and without being personally supplemented is never very productive.
One should never trust a person who, while assuring you of something, puts his hands on his heart.
A writer who wishes to be read by posterity must not be averse to putting hints which might give rise to whole books, or ideas for learned discussions, in some corner of a chapter so that one should think he can afford to throw them away by the thousand.
There is something in the character of every man which cannot be broken in--the skeleton of his character; and to try to alter this is like training a sheep for draught purposes.
I look upon book reviews as an infantile disease which new-born books are subject to.
Most subjects at universities are taught for no other purpose than that they may be re-taught when the students become teachers.
One cannot demand of a scholar that he show himself a scholar everywhere in society, but the whole tenor of his behavior must none the less betray the thinker, he must always be instructive, his way of judging a thing must even in the smallest matters be such that people can see what it will amount to when, quietly and self-collected, he puts this power to scholarly use.
What concerns me alone I only think, what concerns my friends I tell them, what can be of interest to only a limited public I write, and what the world ought to know is printed.
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