Perfect numbers like perfect men are very rare.
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.
The reading of all good books is like a conversation with the finest minds of past centuries.
I think; therefore I am.
The first precept was never to accept a thing as true until I knew it as such without a single doubt.
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.
In order to improve the mind, we ought less to learn, than to contemplate.
It is not enough to have a good mind; the main thing is to use it well.
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