Failure to learn.

They say a shoemaker wears the worts shoes and the dressmaker is dressed too simply to match his own talent.
We all teach others how to live and which mistakes to avoid, but do we actually learn enough from ourselves.
Looking in a mirror a totally different person faces you, that you believe in yourself to be. Teacher keeps a close eye in those who are not willing to learn and keeps discipline in place.
We lock our own mind to a limit. Teach other. But do we actually learn our mistake, never repeat it, but are willing to try again to succeed?