Perfect numbers like perfect men are very rare.
From Rene Descartes
It is not enough to have a good mind; the main thing is to use it well.
The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.
Nothing is more fairly distributed than common sense: no one thinks he needs more of it than he already has.
I am indeed amazed when I consider how weak my mind is and how prone to error.
The reading of all good books is like a conversation with the finest minds of past centuries.
Illusory joy is often worth more than genuine sorrow.
Each problem that I solved became a rule, which served afterwards to solve other problems.
Travelling is almost like talking with those of other centuries.
The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.
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