unknown knowns

I remember this quote because it got mocked. Spoken by a man I couldn't agree with less on matters of policy, the quote below is, however, true, and possibly important.


"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 not know. But there are also unknown unknowns, the ones we don't know we don't know."
—Donald Rumsfeld, Feb. 12, 2002

Perhaps also we could add unknown knowns. Things we do not know we know.

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