What makes a good self-help book?

Donald Robertson How to Think Like a Roman Emperor: The Stoic Philosophy of Marcus Aurelius

Barry Magid Ending the Pursuit of Happiness: A Zen Guide

Oliver Burkeman Three pages a day

Daniel J. Siegel Mindsight: The New Science of Personal Transformation

Anne-Laure Le Cunff Tiny Experiments: How to Live Freely in a Goal-Obsessed World