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Cogito ergo sum (I think, therefore I am)

There is nothing so strange and so unbelievable that it has not been said by one philosopher or another.

Illusory joy is often worth more than genuine sorrow.

I think, therefore I am.

Doubt is the origin of wisdom.

Perfect numbers, like perfect men, are very rare.

Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.
(also attributed to Bertrand Russell)

Each problem that I solved became a rule which served afterwards to solve other problems.
Discours de la Methode

To know what people really think, pay regard to what they do, rather than what they say.

It is not enough to have a good mind. The main thing is to use it well.
(Discours de la Methode, 1637)

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