Ask for no guarantees, ask for no security, there never was such an animal. And if there were, it would be related to the great sloth which hangs upside down in a tree all day every day, sleeping its life away.
Source: Fahrenheit 451
-- Ray Bradbury, (Aug 22 1920-2012), US science-fiction writer; He is best known for SF stories combining social criticism, e.g., Fahrenheit 451 and The Martian Chronicles.