你要懂得及时止损，别太在乎沉没成本

How to Tell That It's Time to Quit

Quitting is usually perceived to be negative, whereas perseverance is seen as admirable and even essential for success in life.
放弃通常被认为是消极的，而毅力被看作是值得钦佩的，甚至在生活中获得成功是非常必要的。

Surprisingly, though, when perseverance is taken too far, it becomes self-destructive. Research shows that people who let go of unattainable goals experience higher well-being. So why is it so hard to surrender?
然而，令人惊讶的是，当毅力充满的太多，他将会变成自我毁灭。调查报告显示放弃无法达到的目标的人们会体验到更高的幸福，所以放弃有什么难的？

凤兮凤兮，何德之衰。
往者不可谏，来者犹可追。