The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.
Except our own thoughts, there is nothing absolutely in our power.
Illusory joy is often worth more than genuine sorrow.
The reading of all good books is like a conversation with the finest minds of past centuries.
If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.
The greatest minds are capable of the greatest vices as well as of the greatest virtues.
Divide each difficulty into as many parts as is feasible and necessary to resolve it.
I think; therefore I am.
It is not enough to have a good mind; the main thing is to use it well.
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