A mathematical formula for happiness:Reality divided by Expectations.There were two ways to be happy:improve your reality or lower your expectations.

Picoult frames happiness as a ratio: how life feels depends not only on circumstances (“reality”) but on the yardstick used to judge them (“expectations”). If expectations are inflated, even decent outcomes can register as disappointment; if expectations are calibrated realistically, the same outcome can feel satisfying. The second sentence turns the metaphor into practical counsel: happiness can be pursued either by changing external conditions (work, relationships, health, environment) or by changing internal demands (entitlement, perfectionism, imagined futures). The quote’s appeal lies in its blunt, almost clinical logic—suggesting that emotional well-being is shaped as much by interpretation and comparison as by events themselves.