Don Quixote’s madness was his refusal to accept the world as it appears to those who see only the world’s back, who smell only the world’s perspiration. Men and women of faith, in their madness, affirm both a compassionate God and a life after death in spite of evidence which suggests (though of course it does not prove) that both affirmations are delusions.

— Martin Gardner, The Whys of a Philosophical Scrivener