Depends on What the Meaning of ‘Know’ Is

Defense Secretary Donald Rumsfeld, today:

I will say this about Iran. They are currently putting people into Iraq to do things that are harmful to the future of Iraq. And we know it.

Joint Chiefs of Staff Chairman Gen. Peter Pace, moments later:

PACE: The most recent reports have to do with individuals [from Iran] crossing the border into Iraq.

QUESTION: Do you believe it’s backed by the government or are they individual elements not backed by the central government?

PACE: I do not know.

Confused? All is answered below the fold:

The Unknown
by Donald Rumsfeld

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.

“”Feb. 12, 2002, Department of Defense news briefing