The Conquest of Happiness
Nearly a century old and still surprisingly useful, Russell's 1930 essay diagnoses the real culprits behind modern unhappiness — envy, self-absorption, boredom — and prescribes a simple antidote: turn your attention outward. His term 'zest' captures it well: people who stay curious about the world around them tend to be happier than those who dwell on themselves. The prose is clear and often witty, making philosophy feel like a conversation rather than a lecture. The caveat is that Russell was a secular atheist writing from a position of privilege, and readers who ground their sense of purpose in faith will notice the absence of any spiritual dimension. Still worth the read for its clear-eyed diagnosis.