"--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."
— Donald Barthelme