He who knows and knows that he knows is a Teacher. Learn from him.
He who knows not and knows that he knows not is a student. Teach him.
He who knows not and knows not that he knows not is a menace. Avoid him.
He who knows and knows not that he knows is our Attorney General. Impeach him.

Even Rumsfeld didn't think of unknown knowns which we don't know if we know and that he would loose his record as most dishonest loyal Bushie ever.