The Metaphysics of Donald Rumsfeld.

The Unknown

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.

This is a very old article, but I thought it would be fun to link to it again. The "poem" above is really quite brilliant, and even metaphysically profound!

There is another fantastic (and profound) saying of his not listed. To paraphrase from memory (actually the memory of a friend): "You are starting wiyh an illogical assumption and proceeding logically to an illogical conclusion." Saying this will win you every argument ever!