The superfluous, a very necessary thing.

Friendship is the marriage of the soul, and this marriage is liable to divorce.

Despite the enormous quantity of books, how few people read! And if one reads profitably, one would realize how much stupid stuff the vulgar herd is content to swallow every day.

They are mad men (Jews), but you should not burn them for that.

Theology is to religion what poisons are to food.

If God did not exist, He would have to be invented. But all nature cries aloud that he does exist: that there is a supreme intelligence, an immense power, an admirable order, and everything teaches us our own dependence on it.

Come! you presence will either give me life or kill me with pleasure.