《汉书·传·王贡两龚鲍传》
谷郑子真不屈其志，耕作于岩石之下，名声却响于整个京城，难道是因为其身为公卿吗？
谷口郑子真不诎其志，耕于岩石之下，名震于京师，岂其卿？
Gu Zhengzi truly did not bend his will. He farmed beneath rocks, but his reputation resounded throughout the capital. Was it because he was a high-ranking official?