Skip to main content

Daily Inspiration Quote by Hermann Ebbinghaus

"The constant flux and caprice of mental events do not admit of the establishment of stable experimental conditions"

About this Quote

Ebbinghaus is doing something sly here: he’s warning you that the mind refuses to sit still long enough to be treated like a laboratory specimen, even as he’s helping invent the very experimental psychology that will try anyway. “Flux” and “caprice” are not decorative nouns. They’re an argument against naive scientism, a preemptive strike on critics who expect the tidy repeatability of chemistry from a system built out of attention, mood, fatigue, memory, expectation, and language - variables that mutate the moment you start observing them.

The line’s intent is methodological humility with a strategic edge. Ebbinghaus isn’t conceding defeat; he’s staking out the hard problem that makes psychology necessary. By framing mental life as unstable, he legitimizes the field’s distinctive tools: controlled but imperfect experiments, statistical regularities rather than mechanical laws, and designs that respect noise instead of pretending it away. The subtext is also a subtle rebuke to introspection-heavy philosophy: if inner life is this mercurial, then armchair certainty is a fantasy, and measurement becomes the only honest discipline.

Context matters: late 19th-century psychology is desperate to be taken seriously as science. Ebbinghaus, famous for timing his own memory and charting the forgetting curve, knows how fragile “stable conditions” are when the subject carries the apparatus inside his skull. The quote lands as a thesis for modern cognitive science’s uneasy bargain: we can quantify the mind, but only by admitting how much it wriggles out of our grasp.

Quote Details

TopicLearning
SourceHelp us find the source
Cite

Citation Formats

APA Style (7th ed.)
Ebbinghaus, Hermann. (2026, January 17). The constant flux and caprice of mental events do not admit of the establishment of stable experimental conditions. FixQuotes. https://fixquotes.com/quotes/the-constant-flux-and-caprice-of-mental-events-do-77943/

Chicago Style
Ebbinghaus, Hermann. "The constant flux and caprice of mental events do not admit of the establishment of stable experimental conditions." FixQuotes. January 17, 2026. https://fixquotes.com/quotes/the-constant-flux-and-caprice-of-mental-events-do-77943/.

MLA Style (9th ed.)
"The constant flux and caprice of mental events do not admit of the establishment of stable experimental conditions." FixQuotes, 17 Jan. 2026, https://fixquotes.com/quotes/the-constant-flux-and-caprice-of-mental-events-do-77943/. Accessed 10 Feb. 2026.

More Quotes by Hermann Add to List
Ebbinghaus: Mental Flux Defies Stable Experimental Conditions
Click to enlarge Portrait | Landscape

About the Author

Germany Flag

Hermann Ebbinghaus (January 24, 1850 - February 26, 1909) was a Psychologist from Germany.

18 more quotes available

View Profile

Similar Quotes

Friedrich August von Hayek, Economist