《史记·七十列传·张仪列传》
我听说，想使国家富强的人，一定要开拓他的疆土；想使军队强大的人，一定要使百姓富足；想要统一天下的人，一定要广施恩德。这三种条件具备了，帝王大业也就水到渠成了。
臣闻之，欲富国者务广其地，欲彊兵者务富其民，欲王者务博其德，三资者备而王随之矣。
I have heard that those who want to make their country rich and strong must expand its territory; those who want to make their army strong must make their people rich; those who want to unify the world must be widely benevolent. When these three conditions are met, the great cause of an emperor will come to fruition.