1. The man who knows and he knows that he knows:
This is the Scholar, so follow him.
2. The man who knows but he does not know that he knows:
This is the Forgetful One, so wake him.
3. The man who does not know, and he knows that he does not know:
This is the Seeker, so guide him.
4. The man who does not know, but he does not know that he does not know:
This is the Ignoramus, so leave him.