life lesson

British  

noun

1. something from which useful knowledge or principles can be learned

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Example Sentences

He said that instead of hiding his disability from the children the couple care for, he had been open with them and used it as a way of teaching an important life lesson.

From BBC

The thing self-help books tend not to tell you—the thing they brush aside because their authors have to, you know, sell books—is that we usually don’t get to choose when and where we learn a life lesson.

From The Wall Street Journal

That’s more of a life lesson than I thought I would receive when I bought it.

From The Wall Street Journal

A goalkeeper and then a midfielder, he tried out for Manchester United where he learned the life lesson that he was "good but not good enough".

From BBC

When I see comedians indulge in that, where they’re giving a life lesson talk, I want to tell them, “No one came here for this. You are there to be funny.”

From Los Angeles Times