《商君书·垦令》
百姓的负担公平，就会谨慎对待自己的职业，百姓慎重对待自己的职业就不会轻易改变。
民平，则慎；慎，则难变。
When the people’s burdens are fair, they will be prudent in pursuing their occupations, and if the people are prudent in pursuing their occupations, they will not easily change them.