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.
Updated 4th February 2010 at 03:08 PM by Matt