Most people who have found that they are more intelligent than most around them, have yet to learn that one of the most intelligent things they can do is prevent said people ever finding this out.

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A Thaum is the basic unit of magical strength. It has been universally established as the amount of magic needed to create one small white pigeon or three normal-sized billiard balls.

The trouble was that he was talking in philosophy but they were listening in gibberish.

The people of Ankh-Morpork had a straightforward, no-nonsense approach to entertainment, and while they were looking forward to seeing a dragon slain, they'd be happy to settle instead for seeing someone being baked alive in his own armour. You didn't get the chance every day to see someone baked alive in their own armour. It would be something for the children to remember.

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

The thing about stories is you have to pick the ones that last.