"The Greatest Salesman in the World" by Og Mandino is a timeless self-help book that tells the story of Hafid, a poor camel boy who aspires to become the greatest salesman in the world. Through the guidance of his mentor and ten sacred scrolls, Hafid learns valuable life lessons about forming good habits, persisting until success, and mastering emotions. This book is not just about salesmanship but offers wisdom on achieving success in all aspects of life.