This book is about the inner attempt to square a circle by living the art of devoted serenity, enthusiastic cheerfulness, involved tranquility, committed calmness, engaged composure, passionate detachment, dedicated coolness, detached concern, consecrated calm, or burning cheerfulness. The art of devoted serenity leads from reacting to external influences on focused action. This book appeals to people who want to work devoted to their everyday professional and family lives without becoming absorbed and paralyzed. This book shows ways to act with inner fire without burning out.