Donald Rumsfeld Known Quotations

There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know.

We've always known that there are people who've tried to infiltrate the various security forces and get to close access to places they ought not to be. There's nothing new about that that I know of.

Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do no know. But there are also unknown unknowns -- the ones we don't know we don't know