前事不忘,后事之师

Traditional (Taiwan): 前事不忘,後事之師

qiánshìbùwànghòushìzhīshī ㄑㄧㄢˊ ㄕˋ ㄅㄨˋ ㄨㄤˋ ㄏㄡˋ ㄕˋ ㄓ ㄕ

    • remembering past experience serves as a guide for the future lessons of the past are a guide for the future

      idiom

Sources