" What demons had Idar Vetlesen been grappling with? Had he brought them here, or was this the sanctuary, the refuge? Perhaps he had discovered some answers, but not all of them. Never all of them. Like whether madness and evil are two different entities, or whether when we no longer understand the purpose of destruction we simply term it madness. We’re capable of understanding that someone has to drop an atomic bomb on a town of innocent civilians, but not that others have to cut up prostitutes who spread disease and moral depravity in the slums of London. Hence we call the former realism and the latter madness "

― Jo Nesbø , The Snowman (Harry Hole, #7)