Belief is one of the most powerful organic forces in the multiverse. It may not be able to move mountains, exactly. But it can create someone who can. People get exactly the wrong idea about belief. They think it works back to front. They think the sequence is, first object, then belief. In fact, it works the other way.
Terry PratchettOne of the recurring philosophical questions is: 'Does a falling tree in the forest make a sound when there is no one to hear?' Which says something about the nature of philosophers , because there is always someone in a forest. It may only be a badger, wondering what that cracking noise was, or a squirrel a bit puzzled by all the scenery going upwards, but someone.
Terry Pratchett