“The reading of all good books is like a conversation with the finest minds of past centuries.”
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The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.
I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.
Each problem that I solved became a rule, which served afterwards to solve other problems.
The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.