Perfect numbers like perfect men are very rare.
Common sense is the most fairly distributed thing in the world, for each one thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have.
The reading of all good books is like a conversation with the finest minds of past centuries.
Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.
I think; therefore I am.
In order to improve the mind, we ought less to learn, than to contemplate.
Divide each difficulty into as many parts as is feasible and necessary to resolve it.
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.
It is not enough to have a good mind; the main thing is to use it well.
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