there are four types of humankind :

1. the man who does not know, and he doesn't know that he doesn't know, he is a stupid man. GO AWAY FROM HIM.
2. the man who doesn't know, and he knows he doesn't know. he is honest. TEACH HIM.
3. the man who knows, and he doesn't know that he knows. that man is sleeping. WAKE HIM UP.
4. the man who knows, and he knows that he knows. he is a wise man. FOLLOW HIM.