Lord Pingyuan of Zhao was choosing twenty retainers for a mission to Chu when Mao Sui offered himself. The lord asked how long he had served. Three years, said Mao Sui. “A capable man in the world is like an awl in a bag,” the lord replied. “Its tip shows at once.” In three years, no one had praised Mao Sui, so the lord concluded that he had nothing.
“Then today I ask to be put in the bag,” Mao Sui answered. “Had I been put in it earlier, the whole awl would have slipped out, not only the tip.” The other nineteen exchanged mocking looks. In Chu, they all gave way to him in debate. (Records of the Grand Historian)
The idiom Mao Sui zi jian, Mao Sui recommends himself, means to volunteer oneself. The lord’s first question had been how long he had served.