It is a popular fact that nine-tenths of the brain is not used and, like most popular facts, it is wrong. Not even the most stupid Creator would go to the trouble of making the human head carry around several pounds of unnecessary gray goo if its only real purpose was, for example, to serve as a delicacy for certain remote tribesmen in unexplored valleys.

The universe was bad enough without people poking it.

The power of prayer and faith can heal and bring happiness. The real tragedy is that the people that are helped by this don't realize that this power is really coming from within.

A good man will kill you with hardly a word.

Nanny Ogg could see the future in the froth on a beer mug. It invariably showed that she was going to enjoy a refreshing drink which she almost certainly was not going to pay for.

A Thaum is the basic unit of magical strength. It has been universally established as the amount of magic needed to create one small white pigeon or three normal-sized billiard balls.

Granny Weatherwax was not lost. She wasn't the kind of person who ever became lost. It was just that, at the moment, while she knew exactly where SHE was, she didn't know the position of anywhere else.