expression
one man's fault is another's lesson; learn from others' mistakes
Proverb meaning that observing others' behavior helps you correct your own. Often used as advice to reflect on your own actions when you see someone else's faults.
人の振り見て我が振り直せというから、彼の失敗を自分の教訓にしよう。
As the saying goes, 'one man's fault is another's lesson,' so let's take his failure as a lesson for ourselves.
A similar proverb meaning 'a lesson from another's mistake,' but 他山の石 is more literary and often used in formal contexts, while 人の振り見て我が振り直せ is a colloquial, everyday saying.
A traditional Japanese proverb. The exact origin is uncertain, but it reflects a common cultural emphasis on self-reflection through observing others.