"Memories can be vile, repulsive, little brutes, like children, I suppose. Heh. But can we live without them? Memories are what our reason is based upon. If we can’t face them, we deny reason itself… Although, why not? We aren't contractually tied down to rationality! There is no sanity clause! So when you find yourself locked onto an unpleasant train of thought, heading for the places in your past where the screaming is unbearable, remember there’s always madness. You can just step outside, and close the door on all those dreadful things that happened. You can lock them away... forever. Madness is the emergency exit."