There is nothing so strange and so unbelievable that it has not been said by one philosopher or another.
Rene DescartesWhen I consider this carefully, I find not a single property which with certainty separates the waking state from the dream. How can you be certain that your whole life is not a dream?
Rene DescartesIf you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
Rene Descartes