One year, he was sent by the king of Song on a mission to Qin. On setting off, he was allotted several carriages to go with him.
When he arrived in Qin, the king of Qin liked him very much and thus gave him another hundred carriages.
After he returned to Song, he was so happy that he showed off his experience everywhere.
Zhuang Zi replied: "When the king of Qin is ill, the doctor whom he calls to open an ulcer or squeeze a boil receives a carriage; and the one who licks his piles receives five. The lower the service, the more are the carriages given. Sir, You must have licked the king's piles? Otherwise, why did you get so many carriages? Go away!'
This story is from Lie Yu Kou, a article of Zhuang Zi. The reason that Zhuang Zi said something so ironic was not that he was jealous of Cao Shang but that he tried to illustrate a point that the more profit someone obtain for himself, the more low tricks he may have to use.