There is only one virtue, justice; only one duty, to be happy; only one corollary, not to overvalue life and not to fear death.

Does not vanity itself cease to be blamable, is it not even ennobled, when it is directed to laudable objects, when it confines itself to prompting us to great and generous actions?

In general, children, like men, and men, like children, prefer entertainment to education.

There is less harm to be suffered in being mad among madmen than in being sane all by oneself.

Passions destroy more prejudices than philosophy does.

Fanaticism is just one step away from barbarism.

I have not the hope of being immortal, because the desire of it has not given me that vanity.