"The ideal reasoner, he remarked, would, when he had once been shown a single fact in all its bearings, deduce from it not only all the chain of events which led up to it but also all the results which would follow from it"
About this Quote
The intent is partly programmatic. Doyle is sketching the operating system of Sherlock Holmes, a character built to make modern life feel manageable at the very moment it was getting noisier, faster, and harder to interpret. Late-Victorian London is a data storm: crowded streets, new bureaucracies, emerging forensic science, headlines, rumors. Against that chaos, "a single fact" becomes a life raft - proof that the right mind can impose order without needing moral certainty or political power.
The subtext is the seduction and the danger of deduction-as-totalizing. "All its bearings" quietly does a lot of work: who gets to decide which bearings matter? The quote flatters the detective's gaze as neutral, but it also reveals how authoritarian certainty can masquerade as pure reasoning. Holmes-like inference promises inevitability - past and future locked in place once the fact is properly seen. Doyle's trick is that the line sells the romance of rationality while smuggling in its hubris: the dream that a human being can see the whole board, not just the next move.
Quote Details
| Topic | Reason & Logic |
|---|---|
| Source | Help us find the source |
| Cite | Cite this Quote |
Citation Formats
APA Style (7th ed.)
Doyle, Arthur Conan. (2026, January 15). The ideal reasoner, he remarked, would, when he had once been shown a single fact in all its bearings, deduce from it not only all the chain of events which led up to it but also all the results which would follow from it. FixQuotes. https://fixquotes.com/quotes/the-ideal-reasoner-he-remarked-would-when-he-had-12870/
Chicago Style
Doyle, Arthur Conan. "The ideal reasoner, he remarked, would, when he had once been shown a single fact in all its bearings, deduce from it not only all the chain of events which led up to it but also all the results which would follow from it." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/the-ideal-reasoner-he-remarked-would-when-he-had-12870/.
MLA Style (9th ed.)
"The ideal reasoner, he remarked, would, when he had once been shown a single fact in all its bearings, deduce from it not only all the chain of events which led up to it but also all the results which would follow from it." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/the-ideal-reasoner-he-remarked-would-when-he-had-12870/. Accessed 4 Feb. 2026.











