《汉书·传·货殖传》
士人在学习读书的地方相互议论仁义，工匠在官府裹相互议论技巧，商人在市场上相互议论财利，农民在田野中相互议论农事。他们从早到晚从事一种职业，不会见异思迁。
士相与言仁谊于闲宴，工相与议技巧于官府，商相与语财利于市井，农相与谋稼穑于田野，朝夕从事，不见异物而迁焉。
Scholars discussed benevolence and righteousness with each other in the places where they studied, artisans discussed skills with each other in government offices, merchants discussed wealth in the market, and farmers discussed farming in the field. They engaged in one occupation from morning till night and would not change their minds when they saw something different.