This is called the main principle of Dao.
Fifteen
The virtue of the ancients made they who were scholars
subtle, mysterious, obscure, deep, and penetrating.
Their mysterious depths can not be understood.
Now : only because they can not be understood,
Therefore we try to emulate their appearance :
Hesitant!, as if crossing a winter stream.
Wary!, as if afraid of their neighbors all around.
Respectful!, they are like a visiting guest.