Mistakes and failure are the ultimate teachers but the School of Hard Knocks Degree is a truckload of self delusion, friends. Your ability to eat a shit sandwich and not vomit makes you an expert in exactly jackshit except for being expert in being YOU and your poor taste in sandwiches. And, I hate to break it to you but YOU are not representative of any group larger than that mirror self you notice getting older and saggier every day.