"A man said to the Universe, 'Sir, I exist.' 'However,' replied the Universe, 'That fact has not created in me a sense of obligation.'" - Crane, Stephen (1871-1900)

"The mind does not understand its own reason for being. ," - Magritte, Rene

"The philosophers of the Middle Ages demonstrated both that the Earth did not exist and also that it was flat. Today they are still arguing about whether the world exists, but they no longer dispute about whether it is flat." - Stefansson, Vilhjalmur