The thing about witchcraft," said Mistress Weatherwax, "is that it's not like school at all. First you get the test, and then afterward you spend years findin' out how you passed it. It's a bit like life in that respect
Terry PratchettIt's hard to explain," said Brutha. "But I think it's got something to do with how people should behave... you should do things because they're right. Not because gods say so. They might say something different another time.
Terry PratchettA lot hinges on the fact that, in most circumstances, people are not allowed to hit you with a mallet. They put up all kinds of visible and invisible signs that say, 'Do not do this' in the hope that it'll work, but if it doesn't, then they shrug, because there is, really, no real mallet at all.
Terry Pratchett