“To know and yet (think) we do not know is the highest (attainment); not to know (and yet think) we do know is a disease.”

“To know that you do not know is the best.To think you know when you do not is a disease.Recognizing this disease as a disease is to be free of it.”

“In the highest antiquity, (the people) did not know that there were (their rulers).”

“I know hereby what advantage belongs to doing nothing (with a purpose).”

“they all know the skill of the skilful, and in doing this they have (the idea of) what the want of skill is.”

“All in the world know the beauty of the beautiful, and in doing this they have (the idea of) what ugliness is;”

“All things return (to their root and disappear), and do not know that it is it which presides over their doing so;—it may be named in the greatest things.”