春秋曰：四民均則王道興而百姓寧，所謂四民者，士農工商也。
In the State Annals, it says, “When the four classes of people are equal in sustenance, the kingly way will flourish, and the people will be at peace.
The four classes of people are men-of-service, farmers, craftsmen, and merchants.” On the Importance of the Way of Marriage