“There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know.”
Author details
Related authors
Other Donald Rumsfeld Quotes
Presidential leadership needn't always cost money. Look for low- and no-cost options. They can be surprisingly effective.
Donald Rumsfeld 
60% of people like this quote
Don't be a bottleneck. If a matter is not a decision for the President or you, delegate it. Force responsibility down and out. Find problem areas, add structure and delegate. The pressure is to do the reverse. Resist it.
Donald Rumsfeld
59% of people like this quote
Enjoy your time in public service. It may well be one of the most interesting and challenging times of your life.
Donald Rumsfeld
58% of people like this quote
It is easier to get into something than to get out of it.
Donald Rumsfeld
58% of people like this quote