Qin Mu Gong asked Bole to recommend his successor. Bole said Jiufanggao could afford the post. Under the orders of Lord Mu, Jiufanggao went out to look for horses and returned three months later to say that the horses had been found.  Mu Gong asked: where is the horse? Jiufanggao replied: yellow male horse.  Mu Gong sent someone to pick up the horse, and the horse taker reported that it was a black mare. Mu Gong is not happy, responsibility Bole: the person you recommend can't even distinguish between the yellow and black male and female of a horse, how can you tell whether it is good or bad?As Jiufanggao observed, the mystery between heaven and earth: he got its subtlety, gave up its roughness, examined its interior and forgot its appearance, saw what he should have seen, but did not see what he did not have to see, inspected the places he should have explored, and abandoned the places he did not have to explore. People like Jiufanggao who are good at identifying Chollima are indeed more valuable than Chollima.  When the horse arrives, it is really a good horse in the world.
The statement 'Chollima cannot be distinguished by the color and gender of the horse' supports the main point above.