My own books drive themselves. I know roughly where a book is going to end, but essentially the story develops under my fingers. It's just a matter of joining the dots.

Oh, my dear Vimes, history changes all the time. It is constantly being re-examined and re-evaluated, otherwise how would we be able to keep historians occupied? We can't possibly allow people with their sort of minds to walk around with time on their hands.

It's a sword. said the Hogfather. They're not meant to be safe.

Getting an education was a bit like a communicable sexual disease. It made you unsuitable for a lot of jobs and then you had the urge to pass it on.

Truth! Freedom! Justice! And a hard-boiled egg!

People are bound to get excited when they see a ten-million-ton starship trying to fly down the street.

There are, almost by definition, an unlimited number of Hells - potentially at least a personal one for every living sapient being.