[DannyTN]

“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.”
-Donald Rumsfeld

[IamConservative]

Reminds me of an old saying an old engine builder used all the time.

“It ain’t what you know that blows’em up. It’s what you know that ain’t so.”

[RobinOfKingston]

“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.” -Donald Rumsfeld

I might add that there are "unknown knowns." This is damn near anything obama utters during his waking hours.

[Vendome]

Zactly...