Why don't they teach us about this early on in life? Wait a second, my father has been telling me this for years :D Only after being hammered to death by life

Why don't they teach us about this early on in life? Wait a second, my father has been telling me this for years :D Only after being hammered to death by life (and my father's gentle reminders) I'm beginning to finally understand it. I suppose one needs to understand/experience it our own way.