《资治通鉴·晋纪·晋纪四》
处理事情在一开始的时候就去区分事情办得好还是不好，是很难观察出来的，等到事情的发展显示出了成功与失败，这时候再去区分功劳与罪过就很容易识别了。
夫居事始以别能否，甚难察也；因成败以分功罪，甚易识也。
It is difficult to tell in the early stages of an undertaking whether things are going well badly, but once success or failure has been achieved, it becomes easy to distinguish achievement from wrongdoing.