"To be absolutely certain about something, one must know everything or nothing about it"
About this Quote
The construction is deliberately binary, almost clinical. “Everything or nothing” compresses the messy middle of partial information into a stark moral of method: serious actors live in uncertainty, so anyone performing total conviction is either bluffing or blind. Kissinger’s subtext is also self-exonerating. If outcomes hinge on unknowable variables, then “mistakes” can be reframed as the price of navigating a world too complex for clean accountability. It’s a sentence that can scold hawkish overreach while quietly insulating the decision-maker from the expectation of perfect foresight.
Context matters: Kissinger’s career unfolded in the fog of the Cold War, where intelligence was incomplete, adversaries strategic, and time compressed. Detente, secret channels, the opening to China, Vietnam’s grim arithmetic - each depended on choosing under ambiguity, then retrofitting those choices into a coherent narrative. The quote works because it flatters skepticism and indicts dogma, but it also reveals the real Kissingerian ethic: not certainty, but control of uncertainty’s optics.
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Citation Formats
APA Style (7th ed.)
Kissinger, Henry A. (2026, January 14). To be absolutely certain about something, one must know everything or nothing about it. FixQuotes. https://fixquotes.com/quotes/to-be-absolutely-certain-about-something-one-must-19855/
Chicago Style
Kissinger, Henry A. "To be absolutely certain about something, one must know everything or nothing about it." FixQuotes. January 14, 2026. https://fixquotes.com/quotes/to-be-absolutely-certain-about-something-one-must-19855/.
MLA Style (9th ed.)
"To be absolutely certain about something, one must know everything or nothing about it." FixQuotes, 14 Jan. 2026, https://fixquotes.com/quotes/to-be-absolutely-certain-about-something-one-must-19855/. Accessed 12 Feb. 2026.






