„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. And if one looks throughout the history of our country and other free countries, it is the latter category that tend to be the difficult ones.
The absence of evidence is not evidence of absence, or vice versa.“

Department of Defense news briefing (12 February 2002)
Variant:
Now what is the message there? The message is that there are no "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. So when we do the best we can and we pull all this information together, and we then say well that's basically what we see as the situation, that is really only the known knowns and the known unknowns. And each year, we discover a few more of those unknown unknowns.
:It sounds like a riddle. It isn't a riddle. It is a very serious, important matter.
:There's another way to phrase that and that is that the absence of evidence is not evidence of absence. It is basically saying the same thing in a different way. Simply because you do not have evidence that something exists does not mean that you have evidence that it doesn't exist. And yet almost always, when we make our threat assessments, when we look at the world, we end up basing it on the first two pieces of that puzzle, rather than all three.
:* Extending on his earlier comments in a press conference at NATO Headquarters, Brussels, Belgium (6 June 2002) http://www.nato.int/docu/speech/2002/s020606g.htm
2000s

Übernommen aus Wikiquote. Letzte Aktualisierung 3. Juni 2021. Geschichte
Donald Rumsfeld Foto
Donald Rumsfeld5
US-amerikanischer Politiker 1932

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Stanley Baldwin Foto

„We don't know what Germany really intends. We do know and have long known that France is pacific, and is not a potential enemy. We cannot say that about Germany.“

—  Stanley Baldwin Former Prime Minister of the United Kingdom 1867 - 1947

Conversation with Thomas Jones (28 April 1934), quoted in Thomas Jones, A Diary with Letters. 1931-1950 (Oxford University Press, 1954), p. 129.
1934

Sharron Angle Foto

„So that's what we want is a secure and sovereign nation, and, you know, I don't know that all of you are Latino. Some of you look a little more Asian to me. I don't know that. What we know, what we know about ourselves is that we are a melting pot in this country. My grandchildren are evidence of that. I'm evidence of that. I've been called the first Asian legislator in our Nevada State Assembly.“

—  Sharron Angle Former member of the Nevada Assembly from 1999 to 2007 1949

Jon
Ralston
Angle to Hispanic children: “Some of you look a little more Asian to me”
2010-10-18
Las Vegas Sun
http://www.lasvegassun.com/blogs/ralstons-flash/2010/oct/18/angle-hispanic-children-some-you-look-little-more-/
2010-10-20
Quinn
Bowman
Terence
Burlij
Angle Caught on Tape Again, Tells Latino Students They 'Look a Little More Asian'
2010-10-19
The Rundown
PBS
http://www.pbs.org/newshour/rundown/2010/10/the-morning-line-angle-caught-on-tape-again.html
2010-10-20
speaking to Rancho High School's Hispanic Student Union
Sharron Angle tells Latino students they look Asian
YouTube
2010-10-18
http://www.youtube.com/watch?v=6PHC3SxDmCU
2010-10-20

Marianne Moore Foto

„Some speak of things we know, as new;
And you, of things unknown as things forgot.“

—  Marianne Moore American poet and writer 1887 - 1972

"Quoting an Also Private Thought" (this poem is a very slight reworking of an earlier poem "As Has Been Said")
The Poems of Marianne Moore (2003)

Michael Crichton Foto
P. D. Ouspensky Foto

„The most difficult thing is to know what we do know, and what we do not know.“

—  P. D. Ouspensky, buch Tertium Organum

Quelle: Tertium Organum (1912; 1922), Ch. I
Kontext: The most difficult thing is to know what we do know, and what we do not know.
Therefore, desiring to know anything, we shall before all else determine WHAT we accept as given, and WHAT as demanding definition and proof; that is, determine WHAT we know already, and WHAT we wish to know.
In relation to the knowledge of the world and of ourselves, the conditions would be ideal could we venture to accept nothing as given, and count all as demanding definition and proof. In other words, it would be best to assume that we know nothing, and make this our point of departure.
But unfortunately such conditions are impossible to create. Knowledge must start from some foundation, something must be recognized as known; otherwise we shall be obliged always to define one unknown by means of another.

Robert N. Proctor Foto

„Why do we know what we know and why don't we know what we don't know? What should we know and what shouldn't we know? How might we know differently?“

—  Robert N. Proctor American historian 1954

Quelle: Value-free science?: Purity and power in modern knowledge, 1991, p. 13

Franklin D. Roosevelt Foto

„We have always known that heedless self-interest was bad morals; we know now that it is bad economics.“

—  Franklin D. Roosevelt 32nd President of the United States 1882 - 1945

1930s, Second inaugural address (1937)

Martin Luther King, Jr. Foto

„We begin to wonder if it is due to the fact that we don't know enough. But it can't be that. Because in terms of accumulated knowledge we know more today than men have known in any period of human history. We have the facts at our disposal. We know more about mathematics, about science, about social science, and philosophy than we've ever known in any period of the world's history. So it can't be because we don't know enough. And then we wonder if it is due to the fact that our scientific genius lags behind. That is, if we have not made enough progress scientifically. Well then, it can't be that. For our scientific progress over the past years has been amazing.“

—  Martin Luther King, Jr. American clergyman, activist, and leader in the American Civil Rights Movement 1929 - 1968

1950s, Rediscovering Lost Values (1954)
Kontext: There is something wrong with our world, something fundamentally and basically wrong. I don't think we have to look too far to see that. I'm sure that most of you would agree with me in making that assertion. And when we stop to analyze the cause of our world's ills, many things come to mind. We begin to wonder if it is due to the fact that we don't know enough. But it can't be that. Because in terms of accumulated knowledge we know more today than men have known in any period of human history. We have the facts at our disposal. We know more about mathematics, about science, about social science, and philosophy than we've ever known in any period of the world's history. So it can't be because we don't know enough. And then we wonder if it is due to the fact that our scientific genius lags behind. That is, if we have not made enough progress scientifically. Well then, it can't be that. For our scientific progress over the past years has been amazing. Man through his scientific genius has been able to dwarf distance and place time in chains, so that today it's possible to eat breakfast in New York City and supper in London, England. Back in about 1753 it took a letter three days to go from New York City to Washington, and today you can go from here to China in less time than that. It can't be because man is stagnant in his scientific progress. Man's scientific genius has been amazing. I think we have to look much deeper than that if we are to find the real cause of man's problems and the real cause of the world's ills today. If we are to really find it I think we will have to look in the hearts and souls of men.

John Piper Foto

„We need God in ways we do not know. Don't limit your experience of God to what you can think to ask. Ask for the unknown joy.“

—  John Piper American writer 1946

John Piper Twitter stream http://twitter.com/JohnPiper/statuses/5570283801 (2009-11-09).

Aeschylus Foto

„When we know clearly, then should we discuss:
To guess is one thing, and to know another.“

—  Aeschylus, Agamemnon

Original: (el) Σάφ' εἰδότας χρὴ τῶνδε θυμοῦσθαι πέρι·
τὸ γὰρ τοπάζειν τοῦ σάφ' εἰδέναι δίχα.
Quelle: Oresteia (458 BC), Agamemnon, lines 1368–1369 (tr. E. H. Plumptre)

Elvis Costello Foto

„And it's the damage that we do
And never know
It's the words that we don't say
That scare me so.“

—  Elvis Costello English singer-songwriter 1954

Accidents Will Happen
Song lyrics, Armed Forces (1979)

Rick Perry Foto
Artemus Ward Foto
Brandon Boyd Foto
Arthur Leonard Schawlow Foto

„To do successful research, you don't need to know everything, you just need to know one thing that isn't known.“

—  Arthur Leonard Schawlow American physicist 1921 - 1999

as quoted by [Steven Chu and Charles H. Townes, Biographical Memoirs V.83, National Academies Press, 2003, http://www.nap.edu/catalog.php?record_id=10830, 0-309-08699-X, 201]

Gabrielle Zevin Foto
Richard Feynman Foto
Nicolaus Copernicus Foto

„To know that we know what we know, and that we do not know what we do not know, that is true knowledge.“

—  Nicolaus Copernicus Renaissance mathematician, Polish astronomer, physician 1473 - 1543

Confucius, as quoted in Walden (1854) by Henry David Thoreau, Ch. 1
Misattributed

Confucius Foto

„To know that we know what we know, and that we do not know what we do not know, that is true knowledge.“

—  Confucius Chinese teacher, editor, politician, and philosopher -551 - -479 v.Chr

As quoted in Walden (1854) by Henry David Thoreau, Ch. 1
Attributed

Alvin Plantinga Foto

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