There are many horrible sights in the multiverse. Somehow, though, to a soul attuned to the subtle rhythms of a library, there are few worse sights than a hole where a book ought to be.

You can't trust folk songs. They always sneak up on you.

If words had weight, a single sentence from Death would have anchored a ship.

It was said that life was cheap in Ankh-Morpork. This was of course, completely wrong. Life was often very expensive; you could get death for free.

I thought unicorns were more . . . Fluffy.

Once you've ruled out the impossible then whatever is left, however improbable, must be the truth. The problem lay in working out what was impossible, of course. That was the trick, all right. There was also the curious incident of the orangutan in the night-time.

But is all this true?" said Brutha. Didactylos shrugged. "Could be. Could be. We are here and it is now. The way I see it is, after that, everything tends towards guesswork." "You mean you don't KNOW it's true?" said Brutha. "I THINK it might be," said Didactylos. "I could be wrong. Not being certain is what being a philosopher is all about.