Not-knowing is true knowledge.
Presuming to know is a disease.
First realize that you are sick;
then you can move toward health.
The Master is her own physician.
She has healed herself of all knowing.
Thus she is truly whole.
(translation by Stephen Mitchell, 1995)
To know that you do not know is highest
To not know but think you know is flawed
Only when one recognizes the fault as a fault
can one be without fault
The sages are without fault
Because they recognize the fault as a fault
That is why they are without fault
(translation by Derek Lin, 2006)
If nothing else,
Know you do not know.
(translation by Jeremy M. Miller, 2013)
from I Ching Online