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

Evil always turns up in this world through some genius or other.

If the weather is too cold or rainy, I take shelter in the Regence Cafe, where I entertain myself by watching chess being played. Paris is the world center, and this cafe is the Paris centre for the finest skill at this game.

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

Those who fear the facts will forever try to discredit the fact-finders.

Oh! how near are genius and madness! Men imprison them and chain them, or raise statues to them.

Superstition is more injurious to God than atheism.