You did something because it had always been done, and the explanation was, ‘But we’ve always done it this way.’ A million dead people can’t have been wrong, can they?

The thing about witchcraft," said Mistress Weatherwax, "is that it's not like school at all. First you get the test, and then afterward you spend years findin' out how you passed it. It's a bit like life in that respect

You can think and you can fight, but the world's always movin', and if you wanna stay ahead you gotta dance.

There's a saying that all roads lead to Ankh-Morpork. And it's wrong. All roads lead away from Ankh-Morpork, but sometimes people just walk along them the wrong way.

Little crimes breed big crimes. You smile at little crimes and then big crimes blow your head off.

Of course, it is very important to be sober when you take an exam. Many worthwhile careers in the street-cleansing, fruit-picking and subway-guitar-playing industries have been founded on a lack of understanding of this simple fact.

Always face what you fear. Have just enough money, never too much, and some string. Even if it’s not your fault, it’s your responsibility. Witches deal with things. Never stand between two mirrors. Never cackle. Do what you must do. Never lie, but you don’t always have to be honest. Never wish. Especially don’t wish upon a star, which is astronomically stupid. Open your eyes, and then open your eyes again.