"The establishment of a law, moreover, does not take place when the first thought of it takes form, or even when its significance is recognised, but only when it has been confirmed by the results of the experiment"
About this Quote
The phrasing matters. “Establishment” and “confirmed” sound bureaucratic on purpose, as if natural truth requires paperwork. That’s the subtext: scientific knowledge is a social institution as much as a private revelation. A “law” isn’t just a correct thought; it’s a claim that has survived public, repeatable testing, the kind that other people can run and try to break. He’s defending a culture of restraint against the temptations of premature certainty.
The context makes the stance more pointed. Mendeleev lived in a 19th-century scientific world that was rapidly professionalizing, with flashy theories competing for legitimacy. His own periodic table famously made predictions (gaps for undiscovered elements) that could have remained clever pattern-making if experiments hadn’t later vindicated them. So the quote doubles as self-portrait: confidence, yes, but only the kind that wagers on verification.
It’s also a warning to anyone eager to declare final answers. Recognition is cheap; results are the price of entry.
Quote Details
| Topic | Science |
|---|---|
| Source | Help us find the source |
| Cite |
Citation Formats
APA Style (7th ed.)
Mendeleev, Dmitri. (2026, January 15). The establishment of a law, moreover, does not take place when the first thought of it takes form, or even when its significance is recognised, but only when it has been confirmed by the results of the experiment. FixQuotes. https://fixquotes.com/quotes/the-establishment-of-a-law-moreover-does-not-take-41891/
Chicago Style
Mendeleev, Dmitri. "The establishment of a law, moreover, does not take place when the first thought of it takes form, or even when its significance is recognised, but only when it has been confirmed by the results of the experiment." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/the-establishment-of-a-law-moreover-does-not-take-41891/.
MLA Style (9th ed.)
"The establishment of a law, moreover, does not take place when the first thought of it takes form, or even when its significance is recognised, but only when it has been confirmed by the results of the experiment." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/the-establishment-of-a-law-moreover-does-not-take-41891/. Accessed 12 Feb. 2026.







