A man doesn't know what he knows until he knows what he doesn't know.
Peter's Principle: In an organization, each person rises to the level of his own incompetence.
The modern child will answer you back before you've said anything.
A bore is a person who lights up the room simply by leaving it.
The man who believes he can do it is probably right, and so is the man who believes he can't.
You could generally inform a real close friend: when you have manufactured a idiot of on your own he does not truly feel you've finished a long lasting job.