"There are known knowns, there are things we know that we know. There are known unknowns, that is to say there are things that we now know we don't know. But there are also unknown unknowns, there are things we do not know we don't know, and each year we discover a few more of those unknown unknowns."
"I would not say that the future is necessarily less predictable than the past. I think the past was not predictable when it started."
"I believe what I said yesterday. I don't know what I said, but I know what I think, and I assume that's what I said."
"This is a case of the local liar coming up again and people repeating what he said and forgetting to say that he never -- almost never -- rarely tells the truth."
Donald H. Rumsfeld
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