Sex, Kiu said thoughtfully. And Fear. Get that big old devil behind them with a stick, and my radiant beauty in front of them, and they'll run right off a cliff, if I ask.
I'm a firm believer in Guilt, personally, said Labienus.
Works well on individuals, Kiu conceded.
Nothing like it for subtle motivation. Plant it deeply enough into a mortal's psyche and it twists them endlessly. Labienus sighed. Get it in there young enough and it'll do all your work for you. You'll have only to prod the mortal along with a suggestion now and then.

Chapter 5, The Angel of the Bottomless Deep (p. 227) - The Children of the Company (2005)