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.

The test of good manners is to be patient with the bad ones.

I am better able to retract what I did not say than what I did.

As long as a word remains unspoken, you are its master; once you utter it, you are its slave.

Faith is the summit of the Torah.

Riches bring anxiety; wisdom gives peace of mind.

Jealousy is cruel as the grave: the coals thereof are coals of fire.