Alexander Fleming — "It is not wise to be too dogmatic in science. One must always be prepared to cha…"
It is not wise to be too dogmatic in science. One must always be prepared to change one's mind.
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More from Alexander Fleming
"It is not often that one finds a substance that is both highly bactericidal and non-toxic to animal tissues."
"The laboratory worker who is not prepared to meet with occasional failures will never achieve success."
"I did not invent penicillin. Nature did. I just found it."
"It is the common lot of discoverers to be misunderstood."
"I have been asked by many people how I came to discover penicillin. The answer is that I did not discover it. I just happened to notice it."
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Understanding this quote
What it means
Rigid adherence to existing theories is an obstacle to discovery. Science demands staying open to evidence that contradicts current assumptions, revising conclusions when new data demands it. Intellectual flexibility is not weakness—it is the engine of progress. Certainty closes doors; curiosity keeps them open. Genuine scientific thinking requires the humility to admit error and update understanding, rather than defending a position simply because it was held first.
Relevance to Alexander Fleming
Fleming discovered penicillin in 1928 largely because he noticed something unexpected—a mold contaminating a petri dish had killed surrounding bacteria. A dogmatic scientist would have discarded the contaminated plate as ruined. Instead, Fleming paused, questioned what he saw, and followed the anomaly. His openness to unplanned observation changed medicine forever. His entire career demonstrated that rigid hypothesis-chasing would have caused him to miss one of the most consequential accidental discoveries in history.
The era
In the early-to-mid 20th century, science was rapidly overturning Victorian certainties. Quantum mechanics dismantled Newtonian physics, Einstein rewrote gravity, and germ theory was still reshaping medicine. Yet institutional science remained deeply conservative, with established figures resisting new paradigms. Penicillin itself was initially dismissed and shelved for over a decade after Fleming's 1928 paper. Openness to revision was not assumed—it was a genuine intellectual virtue worth stating explicitly.
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