To know, is to know that you know nothing. That is the meaning of true knowledge.

It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters.

Human behavior flows from three main sources: desire, emotion, and knowledge.

And what, Socrates, is the food of the soul? Surely, I said, knowledge is the food of the soul.

To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.