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  4. Donald Rumsfeld
  5. There are known knowns; there are things we know 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 not know. But there are also unknown unknowns - the ones we don't know we don't know.

Donald Rumsfeld
Knows, Known
Donald Rumsfeld during Department of Defense News Briefing, archive.defense.gov. February 12, 2002.
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 not know. But there are also unknown unknowns - the ones we don't know