learn from past mistakes to avoid future ones ; learn lessons from the past and keep an eye on the future ; take a lesson from the past and avoid future mistakes ; To be forewarned is to be forearmed.
惩前毖后，治病救人 to learn from past mistakes to avoid future ones and cure the sickness to save the patient
无知使人犯错，有错当惩前毖后。
By ignorance we mistake, and by mistake we learn.
youdao
惩前毖后，汉语成语，读音是chéng qián bì hòu，意思是惩处以前的过错,戒慎今后再犯。出自《诗经·周颂·小毖》。
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