I am indeed amazed when I consider how weak my mind is and how prone to error.
The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.
In order to improve the mind, we ought less to learn, than to contemplate.
Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach 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.
Perfect numbers like perfect men are very rare.
The reading of all good books is like a conversation with the finest minds of past centuries.
Divide each difficulty into as many parts as is feasible and necessary to resolve it.
It is not enough to have a good mind; the main thing is to use it well.
I think; therefore I am.
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