" The world is a cornucopia of grays. I believed the romantic interpretation of Casablanca then - love lost for the good of the world - and believe it now. But it is the very ambiguity of Casablanca that keeps it current. No movie can last if it cannot find new things to say to new generations. Captain Renault, the one gray character in a black and white time, would’ve been amused. "

― , Round Up the Usual Suspects: The Making of Casablanca--Bogart, Bergman, and World War II