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

The Truth Shall Make Ye Fret. [Fred. Free.]

Imagination, not intelligence, made us human.

You can't map a sense of humor. Anyway, what is a fantasy map but a space beyond which There Be Dragons? On the Discworld we know that There Be Dragons Everywhere. They might not all have scales and forked tongues, but they Be Here all right, grinning and jostling and trying to sell you souvenirs.

Creatures which, lacking mankind's superior brain power, did not concern themselves with finding someone to blame, and instead tried to find someone to eat.

He was determined to discover the underlying logic behind the universe. Which was going to be hard, because there wasn't one.

I'll be more enthusiastic about encouraging thinking outside the box when there's evidence of any thinking going on inside it.