Chapter 7, Part 8A - Lieh Tzu

Duke Mu of Ch'in said to Po Lo: 'You are now advanced in years. Is there any member of your family whom I could employ to look for horses in your stead?'

Po Lo replied: 'A good horse can be picked out by its general build and appearance. But the superlative horse -- one that raises no dust and leaves no tracks -- is something evanescent and fleeting, elusive as thin air. The talent of my sons lies on a lower plane altogether: they can tell a good horse when they see one, but they cannot tell a superlative horse. I have a friend, however, one Chiu-fang Kao, a hawker of fuel and vegetables, who in things appertaining to horses is nowise my inferior. Pray see him.'
~ Lionel Giles translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Lieh Tzu.