“Real stupidity beats artificial intelligence every time.”

“Every intelligent being, whether it breathes or not, coughs nervously at some time in its life.”

“The demon coughed nervously. Demons do not breathe; however, every intelligent being, whether it breathes or not, coughs nervously at some time in its life. And this was one of them as far as the demon was concerned.”

“But the helmet had gold decoration, and the bespoke armorers had made a new gleaming breastplate with useless gold ornamentation on it. Sam Vimes felt like a class traitor every time he wore it. He hated being thought of as one of those people that wore stupid ornamental armor. It was gilt by association.”

“The merest accident of microgeography had meant that the first man to hear the voice of Om, and who gave Om his view of humans, was a shepherd and not a goatherd. They have quite different ways of looking at the world, and the whole of history might have been different. For sheep are stupid, and have to be driven. But goats are intelligent, and need to be led.”

“The Ephebians believed that every man should have the vote (provided that he wasn't poor, foreign, nor disqualified by reason of being mad, frivolous, or a woman). Every five years someone was elected to be Tyrant, provided he could prove that he was honest, intelligent, sensible, and trustworthy. Immediately after he was elected, of course, it was obvious to everyone that he was a criminal madman and totally out of touch with the view of the ordinary philosopher in the street looking for a towel. And then five years later they elected another one just like him, and really it was amazing how intelligent people kept on making the same mistakes.”

“Imagination, not intelligence, made us human.”