Each problem that I solved became a rule, which served afterwards to solve other problems.
Illusory joy is often worth more than genuine sorrow.
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.
Everything is self-evident.
Perfect numbers like perfect men are very rare.
Divide each difficulty into as many parts as is feasible and necessary to resolve it.
The greatest minds are capable of the greatest vices as well as of the greatest virtues.
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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