—《左传·隐公元年》

格言大意：总是做不符合道义的事情，最终一定会自取灭亡。

Main Idea: If you always do bad things, you are sure to take the road to ruin

共叔段不义（Gongshu Duan not righteous）

  郑庄公和共叔段是亲兄弟，段想作世子，母亲也支持他。庄公继位后，段为京城太叔，不管扩大自己的领地，想伺机夺取皇位。很多大臣不满，请求攻打段。庄公没有答应。共叔段后来起义反叛。由于他多行不义，导致众叛亲离，最后被迫逃亡。
Zhuanggong of Zheng and Gongshu Duan are brothers.Duan wanted to become the crown prince and his mother supported him. After Zhuanggong succeeded to the throne, Duan became a lord .He expanded his area continuously hoping to seize the throne. Many ministers were not satisfied with Duan and begged Zhuanggong to attack him, but Zhuanggong would not allow this. After then, Duan mounted an insurrection all the same. Always doing bad things, he was forsaken by his friends and relatives.So, he failed and fled finally.