Question

failures may teach something but why we don't want it...?

Answer 1

cause the initial part of the lesson is bitter which blinds us to the glittering end..

Answer 2

failures tech us to work hard more and get success in life but we don't want failures because of it many get dissapointed and many even never try again for it..... and loose their hopes.... this is the reason we don't want failure..

hope it helps
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