Generally speaking, lessons affect you in some way: You get smarter, or faster, happier, or more skillful. A world lesson impacts you physically with effort and motion, triggers emotional reactions, and then, as you work it through, or think it over later, it affects you intellectually. A world lesson is something that you live through and sort out. You remember it, because it makes sense within the context of your life. You have confidence in it, because it is rooted in your own experience. It becomes an element in your future decisions. It changes attitude and behavior.