give away nothing you own, and make no promises.
Attempts to bargain with or control the forces one does not fully understand rarely end …. without consequences. p. 68
That was the thing a lot of people didn’t understand. Magic abhorred imbalance. And always exacted a price. pp. 25, 286, 299, 385
~ A Master of Djinn, by P. Djèlí Clark (2021)

