La plus belle des ruses du diable est
de vous persuader qu’il n’existe pas.
The finest trick of the devil is to persuade you that he does not exist.
Charles Baudelaire, Le Spleen de Paris (1869; posthumous).
Paraphrased in The Usual Suspects as “The greatest trick the Devil ever pulled was convincing the world he didn’t exist.” Sketch of the author is by Édouard Manet.