《史记·十表·六国年表》
论起秦国的德义，还不如鲁卫两国中那些凶暴乖戾的人；计量秦国的兵力，也不如三晋强大，但最后秦国却吞并天下，这不一定就是因为秦国凭据天险，攻守方便，地理形势非常有利，而似乎是上天的帮助。
论秦之德义不如鲁卫之暴戾者，量秦之兵不如三晋之强也，然卒并天下，非必险固便形势利也，盖若天所助焉。
In terms of the goodness or wickedness of the State of Qin, it is not as good as those who are violent and perverse in the states of Lu and Wei; in terms of the military strength of the State of Qin, it is not as strong as the Three Jins, but in the end, the State of Qin annexed the world. This is not necessarily because the State of Qin relied on its natural dangers, making it easy to attack and defend, and its geographical conditions were very favorable, but it seemed like God's help.