When the state of Qin besieged Handan, Zhao sent for help from Zhao, and signed an "alliance" covenant in Chu. Ping Yuanjun found nineteen people, and the rest had nothing to choose from, so there was no way to fill twenty people. A man named Mao Sui recommended himself and said, "I heard that Mr. Wang is going to the State of Chu to sign an agreement and agreed to take twenty diners there. Don't look around. One person is still missing. I hope that Teacher Wang will start with the number of people (me)! " Ping Yuanjun said, "How many years has it been since you came to Zhao Sheng?" Mao Sui said, "It has been three years now."
Ping Yuanjun said: "A wise scholar in the world is like an awl in a bag, and its tip will be revealed immediately. Now, I have been under Zhao Shengmen for three years, and no one around me has praised you. Zhao Sheng (I) has never heard such a compliment, because (you) have no talent. Sir can't (go together), sir, please stay! " Mao Sui said, "I only asked to enter the bag today. If I were in the bag, (I) would show the whole edge, not just the top, just like the sharp awn of the wheat ear. " Ping Yuanjun finally went to Chu with Mao Sui. Nineteen people looked at each other and laughed at him, but they didn't say it.
When he arrived in Chu State, Ping Yuanjun and Chu State had a negotiation on the covenant of "vertical integration", but he couldn't make a decision until noon. So he went in and forced the king of Chu with the hilt in his hand, and made an incisive analysis of the interests, which made the king of Chu promise to sign the Covenant of "vertical integration" at once. Mao Sui said to the nineteen men, "A gentleman is mediocre. This is what people call people who rely on others to get things done. " Ping Yuanjun also thought that he was not good at selecting talents. He said, "When Mr. Mao arrived in Chu, Zhao's prestige was higher than Jiuding and Dalu. Mr. Mao's golden tongue is better than a million troops. Zhao Sheng (I) dare not choose talents again. " So he regarded Mao Sui as a guest of honor.