Beauty is in the eyes of the beholder
 

On the way to Song, Yang meets a man at the twon of Ni,

who has two wives. One is pretty and the other plain.
Yet he favors the plain wife. So Yang asks he why?

The man answers:

"The pretty one knows she is pretty. I don't.
The plain one knows she is plain. I don't.

A bad person knows he is bad. I don't."
Yang says:

"I shall remember the lesson.
The Saint behaves as a Saint, by his own volition."