In order to improve the mind, we ought less to learn, than to contemplate.
Illusory joy is often worth more than genuine sorrow.
Except our own thoughts, there is nothing absolutely in our power.
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.
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 reading of all good books is like a conversation with the finest minds of past centuries.
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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