"We can, of course, be deceived in many ways. We can be deceived by believing what is untrue, but we certainly are also deceived by not believing what is true. We can be deceived by appearances, but we certainly are also deceived by the sagacious appearance, by the flattering conceit that considers itself absolutely secure against being deceived. Which deception is more dangerous? Whose recovery is more doubtful, that of the one who does not see, or that of the person who sees and yet does not see? What is more difficult—to awaken someone who is sleeping or to awaken someone who, awake, is dreaming that he is awake?"