" I hope there isn't,' [a final answer] said Colin. "I'm for uncertainty. As soon as you think you know, you're done for. You don't listen and you can't hear. If you're certain of anything, you shut the door on the possibility of revelation, of discovery. You can think. You can believe. But you can't, you mustn't, 'know'. There's the real Entropy. "

― Alan Garner , Boneland (Tales of Alderley, #3)