It's still magic even if you know how it's done.
(A Hat Full of Sky)
...inside every old person is a young person wondering what happened.
...the proliferation of luminous fungi or iridescent crystals in deep caves where the torchlessly improvident hero needs to see is one of the most obvious intrusions of narrative causality into the physical universe. (The Last Continent)
A good bookshop is just a genteel Black Hole that knows how to read. (Guards! Guards!)
A good plan isn't one where someone wins, it's where nobody thinks they've lost.
A lie can run round the world before the truth has got its boots on.
A lot of the stories were highly suspicious, in her opinion. There was the one that ended when the two good children pushed the wicked witch into her own oven...Stories like this stopped people thinking properly, she was sure. She'd read that one and thought, Excuse me? No one has an oven big enough to get a whole person in, and what made the children think they could just walk around eating people's houses in any case? And why does some boy too stupid to know a cow is worth a lot more than five beans have the right to murder a giant and steal all his gold? Not to mention commit an act of ecological vandalism? And some girl who can't tell the difference between a wolf and her grandmother must either have been as dense as teak or come from an extremely ugly family.
A marriage is always made up of two people who are prepared to swear that only the other one snores. (The Fifth Elephant)
A weapon you held and didn't know how to use belonged to your enemy. (Making Money)
All assassins had a full-length mirror in their rooms, because it would be a terrible insult to anyone to kill them when you were badly dressed. (Pyramids)