汉英词典
Chinese-English Dictionary
MEANING OF 前事不忘,後事之師
don't forget past events, they can guide you in future (idiom); benefit from past experience
师 Borrow / Remember previous experience and lessons as a reference for future work
不忘记过去的经验教训﹐可以作为今后行事的借鉴。语出《战国策.赵策一》"前事之不忘﹐后事之师。"
qián shì bù/bú wàng () hòu zhī () shī
EXAMPLE SENTENCES

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.