“Ninety percent of most magic merely consists of knowing one extra fact.”

“Magic never dies. It merely fades away.”

“It as true that normal people couldn't hear Gaspode speak, because dogs don't speak. It's a well know fact....Besides, almost all dogs don't talk. Ones that do are merely a statistical error, and can therefore be ignored.”

“Nothing-to-see is what most of the universe consists of.”

“That's one form of magic, of course." "What, just knowing things?" "Knowing things that other people don't know.”

“It was octarine, the colour of magic. It was alive and glowing and vibrant and it was the undisputed pigment of the imagination, because wherever it appeared it was a sign that mere matter was a servant of the powers of the magical mind. It was enchantment itself.But Rincewind always thought it looked a sort of greenish-purple.”

“The theater troubled her. It had a magic of its own, one that didn’t belong to her, one that wasn’t in her control. It changed the world, and said things were otherwise than they were. And it was worse than that. It was magic that didn’t belong to magical people. It was commanded by ordinary people, who didn’t know the rules. They altered the world because it sounded better.”