If Donald Rumsfeld said that, he was plagiarizing. I first heard that idea expressed about the time Donald was in diapers. When you've been 21 as long as I have, they say the memory starts to go, so I'm not positive who said it first - I am associating it with Abraham Lincoln, but can't be positive that's correct. Anyhow, the original was that there are 4 kinds of people:
- the ones who don't know and don't know that they don't know
- the ones who don't know and know that they don't know
- the ones who know but don't know that they know
- the ones who know and know that they know
I originally heard this applied to the 4 college years, as "definitions" of freshman, sophomore, junior, and senior, in that order.