CLEVER MAN VS FULLISH MAN Share on NP

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IN MY COUNTRY PPL SAY " A CLEVER MAN LEARN FROM OTHER MEN MISTAKES,AND A FULLISH MAN LEARN FROM HIS OWN" .I BELEIVE IS NOT TRUE.WE HAVE TO GET KNOWLEDGE OF BAD THINGS TO LEARN HOW TO HANDLE IT.ON OUR OWN NOT FROM OTHERS MISTAKE.HOW U SEE AM?