《庄子·杂篇·列御寇》
正考父首次被任命为士便逢人躬着背，再次任命为大夫便深深地弯着腰，第三次任命为卿更谦恭地俯下身子，总是让开大道顺着墙根快步急走，态度如此谦下谁还敢干出不轨之事！
正考父一命而伛，再命而偻，三命而俯，循墙而走，孰敢不轨！
When Zheng Kaofu was first appointed to a position as a commoner, he would meet people with his back bent. When he was appointed as a minister for the second time, he would bow deeply. When he was appointed as a minister for the third time, he would bow more humbly, and would always make way for the main road and walk quickly along the wall. With such a humble attitude, who would dare to do anything improper!