Translations increase the faults of a work and spoil its beauties.

When he who hears does not know what he who speaks means, and when he who speaks does not know what he himself means, that is philosophy.

We admit, in geometry, not only infinite magnitudes, that is to say, magnitudes greater than any assignable magnitude, but infinite magnitudes infinitely greater, the one than the other. This astonishes our dimension of brains, which is only about six inches long, five broad, and six in depth, in the largest heads.

The more I read, the more I acquire, the more certain I am that I know nothing.

Many are destined to reason wrongly; others, not to reason at all; and others, to persecute those who do reason.

All is but illusion and disaster.

The malevolence of men revealed itself to his mind in all of its ugliness