"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"
About this Quote
The intent, in context, was defensive. In 2002, pressed about the absence of evidence on Iraqi weapons of mass destruction, Rumsfeld reframed the question from “Where’s the proof?” to “How do you prove what you can’t see?” By elevating “unknown unknowns,” he introduced a loophole big enough to drive a war through: missing evidence becomes not a problem but a feature of the threat landscape. If the most dangerous dangers are, by definition, invisible, then skepticism can be cast as naivete.
The subtext is power’s favorite move: shifting accountability onto the fog of reality. “Known unknowns” admits gaps, but “unknown unknowns” sanctifies them. It turns decision-making into a performance of prudence, where acting aggressively can be sold as humility before complexity. The line also does cultural work. It anticipates a post-9/11 governing style built on preemption, where worst-case scenarios outrank measurable facts.
That’s why the quote stuck. It’s not merely a logical puzzle; it’s an alibi with good cadence.
Quote Details
| Topic | Knowledge |
|---|---|
| Source | Unverified source: DoD News Briefing , Secretary Rumsfeld and Gen. Myers (Donald Rumsfeld, 2002)
Evidence: Primary-source transcript of a Pentagon (DoD) press briefing. The quote appears in Rumsfeld’s answer near the end of the briefing in response to a question about evidence of links between Iraq and terrorist groups/WMD. The briefing is dated February 12, 2002 (11:30 AM EST/EDT as listed on the tra... Other candidates (2) Philosophy of Medicine (R. Paul Thompson, Ross Upshur, 2017) compilation100.0% ... There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there ar... Donald Rumsfeld (Donald Rumsfeld) compilation93.2% what is the message there the message is that there are no knowns there are things we know that we know there are kno... |
| Cite | Cite this Quote |
Citation Formats
APA Style (7th ed.)
Rumsfeld, Donald. (n.d.). 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. FixQuotes. https://fixquotes.com/quotes/there-are-known-knowns-these-are-things-we-know-51200/
Chicago Style
Rumsfeld, Donald. "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." FixQuotes. Accessed February 2, 2026. https://fixquotes.com/quotes/there-are-known-knowns-these-are-things-we-know-51200/.
MLA Style (9th ed.)
"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." FixQuotes, https://fixquotes.com/quotes/there-are-known-knowns-these-are-things-we-know-51200/. Accessed 2 Feb. 2026.










