夫唯病病,是以不病。
聖人不病,以其病病,是以不病。
Translation
To know that you do not know is the highest attainment.
To not know, yet think you know, is a disease.
Only by recognizing this disease as a disease can one be free of it.
The Sage is free of the disease because he recognizes it as a disease.
Therefore, he is not sick.