Balance. It was all about balance. That had been one of the first things that she had learned: the centre of the seesaw has neither up nor down, but upness and downness flow through it while it remains unmoved. You had to be the centre of the seesaw so the pain flowed through you, not into you. It was very hard. But she could do it!

The universe was bad enough without people poking it.

Apes had it worked out. No ape would philosophize, "The mountain is, and is not." They would think, "The banana is. I will eat the banana. There is no banana. I want another banana.

Most armies are in fact run by their sergeants - the officers are there just to give things a bit of tone and prevent warfare becoming a mere lower-class brawl.

The truth is that even big collections of ordinary books distort space, as can readily be proved by anyone who has been around a really old-fashioned secondhand bookshop, one that looks as though they were designed by M. Escher on a bad day and has more stairways than storeys and those rows of shelves which end in little doors that are surely too small for a full-sized human to enter. The relevant equation is: Knowledge = power = energy = matter = mass; a good bookshop is just a genteel Black Hole that knows how to read.

And Sam Vimes thought: Why is Young Sam's nursery full of farmyard animals anyway? Why are his books full of moo-cows and baa-lambs? He is growing up in the city. He will only see them on a plate! They go sizzle!

I've never really liked the Yanks. ... You can't trust people who pick up the ball all the time when they play football.