Subject: Jealousy
Quote: “In my experience jealousy, however farfetched and extravagant it may seem, is nearly always based on reality. There is a saying…that the customer is always right? Well, the same is true of the jealous husband or wife. However little concrete evidence there may be, fundamentally they are always right.”
Character: M. Hercule Poirot
Chapter/Story: “The Lernean Hydra”
Book Title/Copyright: The Labors of Hercules, 1947