"There is no greater impediment to the advancement of knowledge than the ambiguity of words"
About this Quote
Knowledge doesn’t just stall because we lack facts; it stalls because we can’t agree on what we’re even talking about. Thomas Reid’s line is a philosopher’s diagnosis of an illness he watched spread through Enlightenment debate: smart people generating elaborate systems atop verbal fog. “Ambiguity of words” isn’t a quaint complaint about sloppy diction. It’s an accusation that language itself, when untreated, becomes a machine for producing pseudo-problems - arguments that look rigorous but are really just misunderstandings wearing formal clothes.
Reid is writing in the shadow of Locke and Hume, whose projects often hinged on analyzing “ideas,” “impressions,” “substance,” “cause.” Reid admired the ambition but distrusted the method: if key terms shift meaning mid-argument, then philosophy turns into a hall of mirrors. The intent is corrective and moral. He’s saying: clarity is not a stylistic preference; it’s epistemic hygiene. Without it, even sincerity and intelligence amplify error, because the mind will happily mistake a word for a thing.
The subtext cuts two ways. First, it flatters common sense against elite abstraction: ordinary language, used carefully, is closer to reality than technical vocabularies that hide their own instability. Second, it warns that ambiguity is socially powerful. Vague terms let institutions and ideologies smuggle in conclusions under the cover of consensus. People rally around “freedom,” “reason,” “nature,” “progress” - then discover too late they never shared a definition.
Reid’s punch is that the biggest obstacle to knowledge isn’t ignorance. It’s the false confidence produced when everyone thinks they agree because they’re using the same words.
Reid is writing in the shadow of Locke and Hume, whose projects often hinged on analyzing “ideas,” “impressions,” “substance,” “cause.” Reid admired the ambition but distrusted the method: if key terms shift meaning mid-argument, then philosophy turns into a hall of mirrors. The intent is corrective and moral. He’s saying: clarity is not a stylistic preference; it’s epistemic hygiene. Without it, even sincerity and intelligence amplify error, because the mind will happily mistake a word for a thing.
The subtext cuts two ways. First, it flatters common sense against elite abstraction: ordinary language, used carefully, is closer to reality than technical vocabularies that hide their own instability. Second, it warns that ambiguity is socially powerful. Vague terms let institutions and ideologies smuggle in conclusions under the cover of consensus. People rally around “freedom,” “reason,” “nature,” “progress” - then discover too late they never shared a definition.
Reid’s punch is that the biggest obstacle to knowledge isn’t ignorance. It’s the false confidence produced when everyone thinks they agree because they’re using the same words.
Quote Details
| Topic | Knowledge |
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