A man must become wise at his own expense.
The laws of conscience, though we ascribe them to nature, actually come from custom.
Intelligence is required to be able to know that a man knows not.
When we have got it, we want something else.
Men ... are not agreed about any one thing, not even that heaven is over our heads.
Truly man is a marvelously vain, diverse, and undulating object. It is hard to found any constant and uniform judgment on him.