"If an elderly but distinguished scientist says that something is possible, he is almost certainly right; but if he says that it is impossible, he is very probably wrong"
About this Quote
The intent is less anti-science than anti-complacency. Clarke, a science-fiction writer who built narratives out of yesterday’s absurdities becoming today’s infrastructures, knew how often scientific progress arrives as an embarrassment to the gatekeepers. The subtext: expertise ages into risk management. Reputation becomes a conservative force; the distinguished mind starts defending a map it once helped redraw. Declaring something possible costs little. Declaring it impossible polices status, funding, and the story a field tells about itself.
Context matters: Clarke wrote in a century where flight, nuclear power, space travel, computing, and communications all went from speculative to mundane within a single lifespan. That compression makes “impossible” look like a historically naive word. The wit is in the asymmetry - “almost certainly” versus “very probably” - which reads like a statistical joke and a moral one: trust elders for what they’ve mastered, distrust them for what threatens their mastery. It’s a warning label for innovation culture, aimed at the respectable naysayer inside every institution.
Quote Details
| Topic | Science |
|---|---|
| Source | Verified source: Oxford Treasury of Sayings and Quotations (Susan Ratcliffe, 2011)ISBN: 9780199609123 · ID: IYOcAQAAQBAJ
Evidence:
... If an elderly but distinguished scientist says that something is possible he is almost certainly right , but if he says that it is impossible he is very probably wrong . Arthur C. Clarke 1917-2008 : in New Yorker 9 August 1969 ; see ... |
| Cite |
Citation Formats
APA Style (7th ed.)
Clarke, Arthur C. (2026, February 8). If an elderly but distinguished scientist says that something is possible, he is almost certainly right; but if he says that it is impossible, he is very probably wrong. FixQuotes. https://fixquotes.com/quotes/if-an-elderly-but-distinguished-scientist-says-6466/
Chicago Style
Clarke, Arthur C. "If an elderly but distinguished scientist says that something is possible, he is almost certainly right; but if he says that it is impossible, he is very probably wrong." FixQuotes. February 8, 2026. https://fixquotes.com/quotes/if-an-elderly-but-distinguished-scientist-says-6466/.
MLA Style (9th ed.)
"If an elderly but distinguished scientist says that something is possible, he is almost certainly right; but if he says that it is impossible, he is very probably wrong." FixQuotes, 8 Feb. 2026, https://fixquotes.com/quotes/if-an-elderly-but-distinguished-scientist-says-6466/. Accessed 12 Feb. 2026.







