"It is what we know already that often prevents us from learning"
About this Quote
Bernard, a 19th-century physiologist and architect of experimental medicine (not a psychologist, despite the common mislabel), is speaking from a period when science was trying to discipline itself away from armchair certainty and toward method. His context is the lab: hypotheses are necessary, but they’re also temptations. The subtext is a warning against confirmation bias before we had that term. We don’t just observe; we select. We interpret. We defend. “What we know already” becomes a filter that decides which anomalies count and which get dismissed as noise.
The sentence works because it indicts the most flattering version of ourselves: the educated, experienced, sensible person. Bernard implies that expertise can calcify into a kind of intellectual tendonitis. Learning, then, isn’t merely accumulating facts; it’s practicing the disciplined embarrassment of letting prior knowledge be provisional. In an age of algorithmic feeds and identity-driven opinions, the line reads less like a lab note than a cultural diagnosis: certainty scales; curiosity requires effort.
Quote Details
| Topic | Learning |
|---|---|
| Source | Quote attributed to Claude Bernard; cited on Wikiquote (Claude Bernard). |
| Cite | Cite this Quote |
Citation Formats
APA Style (7th ed.)
Bernard, Claude. (n.d.). It is what we know already that often prevents us from learning. FixQuotes. https://fixquotes.com/quotes/it-is-what-we-know-already-that-often-prevents-us-44705/
Chicago Style
Bernard, Claude. "It is what we know already that often prevents us from learning." FixQuotes. Accessed February 2, 2026. https://fixquotes.com/quotes/it-is-what-we-know-already-that-often-prevents-us-44705/.
MLA Style (9th ed.)
"It is what we know already that often prevents us from learning." FixQuotes, https://fixquotes.com/quotes/it-is-what-we-know-already-that-often-prevents-us-44705/. Accessed 2 Feb. 2026.











