Never having been able to succeed in the world, he took his revenge by speaking ill of it.

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

War is the greatest of all crimes; and yet there is no aggressor who does not color his crime with the pretext of justice.

Whatever you do, crush the infamous thing, and love those who love you.

The system of Descartes... seemed to give a plausible reason for all those phenomena; and this reason seemed more just, as it is simple and intelligible to all capacities. But in philosophy, a student ought to doubt of the things he fancies he understands too easily, as much as of those he does not understand.

The policy of man consists, at first, in endeavoring to arrive at a state equal to that of animals, whom nature has furnished with food, clothing, and shelter.

To succeed in the world it is not enough to be stupid, you must also be well-mannered.