“A man could go far, knowing his rights like you do,” said Granny. “But right now he should go home.” Terry Pratchett, Wyrd Sisters
The duke had a mind that ticked like a clock and, like a clock, it regularly went cuckoo. Terry Pratchett, Wyrd Sisters
Wyrd Sisters (Wikipedia) Wyrd Sisters is Terry Pratchett’s sixth Discworld novel, published in 1988. It re-introduces Granny Weatherwax of Equal Rites.