My favorite Don Rumsfeld quote:
Reports that say that something hasn't happened are always interesting to me, because 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
This comment before the war in Iraq won Rumsfeld the 2003 Award for Gobbledygook from the Plain English Campaign
The true test of character is not how much we
know how to do, but how we behave when we don't know what to do