"--Why are we fighting them? --They're mad. We're sane. --How do we know? --That we're sane? --Yes. --Am I sane? --To all appearances. --And you, do you consider yourself sane? --I do. --Well, there you have it. --But don't they also consider themselves sane? --I think they know. Deep down. That they're not sane. --How must that make them feel? --Terrible, I should think. They must fight ever more fiercely, in order to deny what they know to be true. That they are not sane."