Confucius said: "Don't mention what is past; don't undo what is cast; don't grasp what is blast." – The Analects of Confucius （子曰："成事不说，遂事不谏，既往不咎 。"—《论语》）
What does it mean?
If a person hurt（伤害）him, Confucius said, he would forgive（原谅）him. In his mind, people are never perfect and they make mistakes and do bad things. If people just remember others' bad actions, they will become unhappy. So, why not let the bad things go and look at the future?
The story of Guan Zhong and Duke Huan of Qi during the Spring and Autumn Period is a good example.
Guan Zhong once tried to kill Duke Huan of Qi. But when the Duke knew that Guan could help him look after his kingdom (王国), he forgave what Guan did. So, Guan did his best to help Duke Huan of Qi. Together, they made the kingdom better.
But letting go of bad things in the past doesn't mean forgetting them. Instead, we should learn from them so that we don't make the same mistakes.
