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This is something gabbled at me by an old dragon of a Maths teacher many moons ago. She also predicted me a D at GSCE (Serves me right for disliking her son I guess) but I got 'A's at GCSE, AO and A level so shows how much you knew Mrs A!

Anyway the phrase isn't just used in the context of a personal vendetta against fearful students. Apparently it's part of an ancient Arabic proverb:

He who knows not and knows not he knows not: he is a fool-shun him.
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