前事不忘，后事之师。

Lessons learned from the past can guide one in the future.

《新英汉大辞典》

前事不忘，后事之师，以后你还能帮助遇到相同情况的朋友呢。

Collecting all this knowledge could even help you avoid the situation in the future or assist a friend who is going through something similar.

youdao

前事不忘，后事之师，以后你还能帮助遇到相同情况的朋友呢。

Collecting all this knowledge could even help you avoid the situation in the future or assist a friend who is going through something similar.

youdao