There are known knowns, things we know that we know; and there are known unknowns, things that we know we don't know. But there are also unknown unkn… - Donald Rumsfeld

I don't know what the facts are but somebody's certainly going to sit down with him and find out what he knows that they may not know, and make sure he knows what they know that he may not know, and that's a good thing.

We're so conditioned as a people to think that a military campaign has to be cruise missiles and television images of airplanes dropping bombs, and that's just false. This is a totally different war. We need a new vocabulary. We need to get rid of old think and start thinking about this thing the way it really is.

"There are no "knowns." There are things we know that we know. There are known unknowns. That is to say there are things that we now know we don't know. But there are also unknown unknowns. There are things we do not know we don't know."