And that's when I first learned about evil. It is built in to the very nature of the universe. Every world spins in pain. If there is any kind of supreme being, I told myself, it is up to all of us to become his moral superior.
Terry PratchettVimes struggled to his feet, shook his head and set off after it. No thought was involved. It is the ancient instinct of terriers and policemen to chase anything that runs away.
Terry PratchettIt was written in some holy book, apparently, so that made it okay, and probably compulsory.
Terry Pratchett