《孔子家语·六本》
事后想要悔改也难啊！ 
后虽欲悔，难哉！ 
It's hard to repent after the event!
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 后虽欲悔，难哉！  [/INST] It's hard to repent after the event!</s>
Identify the key themes in this Classical Chinese text and explain them in English: 后虽欲悔，难哉！
user
It's hard to repent after the event!
assistant