Solomon Ibn Gabirol

The first step in the acquisition of wisdom is silence, the second listening, the third memory, the fourth practice, the fifth teaching others.

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.