"I have learned to use the word "impossible" with the greatest caution"
About this Quote
Coming from a rocket scientist, the intent is practical. Aerospace is a graveyard of confident no’s that got buried by better math, better materials, or simply the stubborn accumulation of trials. “Caution” here is about epistemic humility: in complex systems, today’s “impossible” is frequently just “we don’t know how yet” or “we can’t afford the failure modes.” The subtext flatters persistence, but it also disciplines it. You don’t ban the word; you reserve it for cases where you’ve actually done the work to earn certainty.
The context makes the sentence sharper. Von Braun’s career arcs from wartime rocketry to NASA’s moon program, a trajectory that embodies both technological audacity and moral compromise. Against that backdrop, “impossible” reads as a creed of capability - and a reminder that capability is never purely technical. His caution can be heard as a philosophy of innovation, but also as a revealing posture: if the frontier keeps moving, so can accountability. The quote works because it’s inspirational without being sentimental, and because it exposes how a single word can function as both a limit and an alibi.
Quote Details
| Topic | Motivational |
|---|---|
| Source | Help us find the source |
| Cite |
Citation Formats
APA Style (7th ed.)
Braun, Wernher von. (2026, January 14). I have learned to use the word "impossible" with the greatest caution. FixQuotes. https://fixquotes.com/quotes/i-have-learned-to-use-the-word-impossible-with-2325/
Chicago Style
Braun, Wernher von. "I have learned to use the word "impossible" with the greatest caution." FixQuotes. January 14, 2026. https://fixquotes.com/quotes/i-have-learned-to-use-the-word-impossible-with-2325/.
MLA Style (9th ed.)
"I have learned to use the word "impossible" with the greatest caution." FixQuotes, 14 Jan. 2026, https://fixquotes.com/quotes/i-have-learned-to-use-the-word-impossible-with-2325/. Accessed 13 Feb. 2026.









