"In the computer field, the moment of truth is a running program; all else is prophecy"
About this Quote
The subtext is epistemological, but it’s delivered like shop-floor common sense. In computing, knowledge is operational. You don’t really “know” an algorithm, a model, or a system until it survives contact with inputs, edge cases, messy dependencies, and the brute fact of finite resources. A running program is empirical evidence: not of beauty, not even of correctness in some formal sense, but of accountability. It can be tested, timed, debugged, and broken. That’s why it feels like truth: it’s falsifiable in a way slide decks aren’t.
Context matters: Simon helped found AI and cognitive science, fields perennially tempted by grand claims about minds and machines. The line is a quiet rebuke to hype cycles and theoretic overreach. It also defends a culture of iteration: build, run, confront the failure, revise. In a domain where language can easily masquerade as progress, execution is the only honest referee.
Quote Details
| Topic | Coding & Programming |
|---|---|
| Source | Help us find the source |
| Cite |
Citation Formats
APA Style (7th ed.)
Simon, Herbert. (2026, January 17). In the computer field, the moment of truth is a running program; all else is prophecy. FixQuotes. https://fixquotes.com/quotes/in-the-computer-field-the-moment-of-truth-is-a-69350/
Chicago Style
Simon, Herbert. "In the computer field, the moment of truth is a running program; all else is prophecy." FixQuotes. January 17, 2026. https://fixquotes.com/quotes/in-the-computer-field-the-moment-of-truth-is-a-69350/.
MLA Style (9th ed.)
"In the computer field, the moment of truth is a running program; all else is prophecy." FixQuotes, 17 Jan. 2026, https://fixquotes.com/quotes/in-the-computer-field-the-moment-of-truth-is-a-69350/. Accessed 12 Feb. 2026.







