"Put off your imagination, as you put off your overcoat, when you enter the laboratory. Put it on again, as you put on your overcoat, when you leave"
About this Quote
The subtext is a warning about a scientist’s most flattering vice: falling in love with your own explanation. In the lab, Bernard argues, imagination becomes a contaminant. It sneaks into interpretation, nudges you toward confirming what you hoped to find, and turns messy results into a “story” that reads better than it tests. By telling you to “put off” imagination, he’s really asking you to suspend narrative hunger - the urge to force coherence before the data earns it.
Then he gives imagination its dignity back. Put it on again when you leave. Outside the lab, you need speculation to form hypotheses, connect disparate observations, and decide what questions are worth the trouble. This is a blueprint for a two-step epistemology: rigor in measurement, freedom in meaning-making.
Context matters: Bernard was a foundational figure in experimental physiology in 19th-century France, writing at a moment when medicine was fighting to become a method, not a tradition. (He’s often mislabeled a “psychologist.”) The quote is a cultural argument for modern scientific identity: be creative, but only on a leash.
Quote Details
| Topic | Science |
|---|---|
| Source | Claude Bernard, An Introduction to the Study of Experimental Medicine (1865). Commonly cited passage advising to ‘put off your imagination…when you enter the laboratory’ (appears in Bernard’s original 1865 work and standard translations). |
| Cite |
Citation Formats
APA Style (7th ed.)
Bernard, Claude. (2026, January 17). Put off your imagination, as you put off your overcoat, when you enter the laboratory. Put it on again, as you put on your overcoat, when you leave. FixQuotes. https://fixquotes.com/quotes/put-off-your-imagination-as-you-put-off-your-40050/
Chicago Style
Bernard, Claude. "Put off your imagination, as you put off your overcoat, when you enter the laboratory. Put it on again, as you put on your overcoat, when you leave." FixQuotes. January 17, 2026. https://fixquotes.com/quotes/put-off-your-imagination-as-you-put-off-your-40050/.
MLA Style (9th ed.)
"Put off your imagination, as you put off your overcoat, when you enter the laboratory. Put it on again, as you put on your overcoat, when you leave." FixQuotes, 17 Jan. 2026, https://fixquotes.com/quotes/put-off-your-imagination-as-you-put-off-your-40050/. Accessed 12 Feb. 2026.







