《汉书·传·货殖传》
秦灭魏国，将孑家迁徙到南阳。孔氏大力经营冶铸业，又规划农田水利，车骑前呼后拥，交游诸侯，趁机与各诸侯国通商牟利，博得了 游闲公子 的美号。
秦灭魏，迁孔氏南阳，大鼓铸，规陂田，连骑游诸侯，因通商贾之利，有游闲公子之名。
When Qin destroyed the Wei kingdom, it moved the Jie family to Nanyang. The Kong clan vigorously developed the iron casting industry and also planned agricultural water conservancy projects. With chariots and horses in front and behind and surrounded by followers, he socialized with the feudal lords and took advantage of the opportunity to do business with feudal states to make profits, earning the title of "Idle Nobleman."