This is what Dave Ramsey of Financial Peace Revisited thinks about this saying: “That stupid saying "What you don't know can't hurt you" is ridiculous. What you don't know can kill you. If you don't know that tractor trailer trucks hurt when hitting you, then you can play in the middle of the interstate with no fear - but that doesn't mean you won't get killed.” I guess we should fix that saying then to "What you don't know can hurt you". But in education, we could go further and write a saying that provides a useful message: "What you think you know but actually do not know will hurt you."
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