Be careful what you wish for. You never know who will be listening.

The oldest fan letter I've had is from someone aged eighty-five.

Books bend space and time. One reason the owners of those aforesaid little rambling, poky secondhand bookshops always seem slightly unearthly is that many of them really are, having strayed into this world after taking a wrong turning in their own bookshops in worlds where it is considered commendable business practice to wear carpet slippers all the time and open your shop only when you feel like it.

It’s quite easy to accidentally overhear people talking downstairs if you hold an upturned glass to the floorboards and accidentally put your ear to it.

The figures looked more or less human. And they were engaged in religion. You could tell by the knives (it's not murder if you do it for a god).

Logic is a wonderful thing but doesn't always beat actual thought.

Of course, Ankh-Morpork's citizens had always claimed that the river water was incredibly pure. Any water that had passed through so many kidneys, they reasoned, had to be very pure indeed.