"It always seems impossible until it's done"
- Nelson Mandela
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"It always seems impossible until it's done"
- Nelson Mandela
"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."
- United States Secretary of Defense, Donald Rumsfeld