Freedom without limits is just a word.

All the higher life forms scythed away, just like that. [ . . . ] Nothing but dust and fundamentalists.

Sooner or later we're all someone's dog.

I taught myself more in the library than school taught me.

Our garden was debated territory between five local cats, and we'd heard that the best way to keep other cats out of the garden was to have one yourself. A moment's rational thought here will spot the slight flaw in this reasoning.

That's the Ankh-Morpork instinct, Vimes thought. Run away, and then stop and see if anything interesting is going to happen to other people.

I read anything that’s going to be interesting. But you don’t know what it is until you’ve read it. Somewhere in a book on the history of false teeth there’ll be the making of a novel.