Kings may be judges of the earth, but wise men are the judges of kings.
Your secret is your prisoner; once you reveal it, you become its slave.
I am better able to retract what I did not say than what I did.
Plan for this world as if you expect to live forever; but plan for the hereafter as if you expect to die tomorrow.
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.