Knowledge acquired too rapidly and without being personally supplemented is never very productive.
I would give something to know for whose sake precisely those deeds were really done which report says were done for the fatherland.
All mathematical laws which we find in Nature are always suspect to me, in spite of their beauty. They give me no pleasure. They are merely auxiliaries. At close range it is all not true.
Many intelligent people, when about to write . . . , force on their minds a certain notion about style, just as they screw up their faces when they sit for their portraits.
Is it so unjust that a man should leave the world by the same gate through which he entered it?
Honor is infinitely more valuable than positions of honor.
Prejudices are so to speak the mechanical instincts of men: through their prejudices they do without any effort many things they would find too difficult to think through to the point of resolving to do them.
In mathematical analysis we call x the undetermined part of line a: the rest we don't call y, as we do in common life, but a-x. Hence mathematical language has great advantages over the common language.
With God thoughts are colors, with us they are pigments-even the most abstract one may be accompanied by physical pain.
If you are going to build something in the air it is always better to build castles than houses of cards.
We cannot remember too often that when we observe nature, and especially the ordering of nature, it is always ourselves alone we are observing.
No people are more conceited than those who depict their own feelings, especially if they happen to have a little prose at their command for the occasion.
How few friends would remain friends if each could see the sentiments of the other in their entirety.
The greatest things in the world are brought about by other things which we count as nothing: little causes we overlook but which at length accumulate.
Propositions on which all men are in agreement are true: if they are not true we have no truth at all.
Man is perhaps half mind and half matter in the same way as the polyp is half plant and half animal. The strangest creatures are always found on the border lines of species.
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.
If brandy was made out of sparrows there would soon be no sparrows.
One should never trust a person who, while assuring you of something, puts his hands on his heart.
Everyone is a genius at least once a year. The real geniuses simply have their bright ideas closer together.
Man is so perfectable and corruptible he can become a fool through good sense.
Nothing can contribute more to peace of soul than the lack of any opinion whatever.
Sickness is mankind's greatest defect.
Do not commence your exercises in philosophy in those regions where an error can deliver you over to the executioner.
He was then in his fifty-fourth year, when even in the case of poets reason and passion begin to discuss a peace treaty and usually conclude it not very long afterwards.
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