Every piece of marble has a statue in it waiting to be released by a person of sufficient skill to chip away the unnecessary parts. Just as the sculptor is to the marble, so is education to the soul. It releases it. For only educated people are free people. You cannot create a statue by smashing the marble with a hammer, and you cannot by the force of arms release the spirit or the soul of people.
There are three things which the superior man guards against. In youth ... lust. When he is strong ... quarrelsomeness. When he is old ... covetousness.
To know, is to know that you know nothing. That is the meaning of true knowledge. When you say something, say what you know. When you don't know something, say you don't know. That is knowledge.