Quote by Rolf Dobelli

There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that…

— Donald Rumsfeld

There are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know…

— Anonymous

“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…

— Donald Rumsfeld

“And for once, Donald Rumsfeld, in the news at the time over the Iraq war made sense to me: "As we know," he said,…

— Benjamin Mee

“There are things we know we know. . . . We know there are some things we do not know. But there are also…

— Steven J. Wangsness

All Knowledge is Divided into Three Domains: "What We Know", "What We Know That We Don't Know", and "What We Don't Know That We…

— Werner Erhard

What we know is something, what we don't know is everything.

— Lim King Lok

there is only one thing we do know and that is that we do not know anything.

— Gertrude Atherton

Knowledge is knowing that we cannot know.

— Ralph Waldo Emerson

Once a thing is known,it can't be UNknown.

— Chris Crutcher

Knowledge signifies things known. Where there are no things known, there is no knowledge. Where there are no things to be known, there can…

— Frances Wright

“It is not what we know, but what we can prove.”

— Arthur Conan Doyle