Hemingway’s girlfriend, the writer Martha Gellhorn, didn’t think the artist needed to be a monster; she thought the monster needed to make himself into an artist. “A man must be a very great genius to make up for being such a loathsome human being.” (Well, I guess she would know.) She’s saying if you’re a really awful person, you are driven to greatness in order to compensate the world for all the awful shit you are going to do to it. In a way, this is a feminist revision of all of art history; a history she turns with a single acid, brilliant line into a morality tale of compensation.