A good point about the semantic loading of calling someone "failed" -- it can actually be quite disabling if they take you seriously. But I would expect a good teacher to know the difference between an instance of failing, say a test, and labeling someone a failure!! There's no question that promoting getting up and getting it right next time is a lot healthier than promoting the notion that one "is a failure" or "has failed" without offering any hope to the situation. That's just bad teaching.

But that doesn't mean you should pretend that no failing happens.

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