Wise men learn by others' harms, fools by their own.

Understand the thought

Meaning in plain English

You can sometimes avoid a mistake by learning from what happened to someone else. Relevant experience need not become your own loss before you consider what it shows.

What the words are saying

The saying contrasts attention to others’ harms with learning only after suffering the same difficulty oneself. It encourages observation, questions and the use of available accounts before making a choice. Wise and fools are blunt labels, not a reliable way to classify people. Another person’s outcome may involve circumstances that do not apply to the present case. The useful lesson is therefore not to copy every caution unquestioningly, but to ask which part of the earlier experience is relevant. Learning from it can include adapting a plan or arranging a small test, rather than avoiding all unfamiliar action.

Everyday example

A team checks why a similar project missed its deadline and allows time for permissions that the earlier group had not anticipated.

When to use it

Use it when another person’s experience provides relevant information before a decision.

Agent-assisted editorial interpretation. This explains the words; it does not by itself verify their author or earliest origin.