"There are four types of men in this world:
1. The man who knows, and knows that he knows; he is wise, so consult him.
2. The man who knows, but doesn't know that he knows; help him not forget what he knows.
3. The man who knows not, and knows that he knows not; teach him.
4. Finally, there is the man who knows not but pretends that he knows; he is a fool, so avoid him."
Solomon Ibn Gabirol
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