"Platitude: an idea (a) that is admitted to be true by everyone, and (b) that is not true"
About this Quote
The intent is to expose consensus as a suspect form of knowledge. If everyone nods along, Mencken implies, that unanimity is less proof than social pressure - a sign the idea has been sanded down until it can’t cut anyone. Platitudes function as civic sedation: they let you feel aligned with “common sense” without the inconvenience of thinking, testing, or risking disagreement. His twist is not that platitudes are boring; it’s that they’re often actively false, kept afloat by repetition and etiquette rather than reality.
The subtext is vintage Mencken cynicism about mass opinion and the pieties of American public speech: sermons, political slogans, self-help optimism, the whole industry of reassuring phrases that confer virtue on the speaker. Context matters: writing in a period when advertising, propaganda, and boosterism were modernizing fast, Mencken treats popular “truths” as manufactured goods. The joke lands because it flatters the reader’s skepticism while warning them how easily skepticism itself can be domesticated into another slogan.
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Citation Formats
APA Style (7th ed.)
Mencken, H. L. (2026, January 18). Platitude: an idea (a) that is admitted to be true by everyone, and (b) that is not true. FixQuotes. https://fixquotes.com/quotes/platitude-an-idea-a-that-is-admitted-to-be-true-19532/
Chicago Style
Mencken, H. L. "Platitude: an idea (a) that is admitted to be true by everyone, and (b) that is not true." FixQuotes. January 18, 2026. https://fixquotes.com/quotes/platitude-an-idea-a-that-is-admitted-to-be-true-19532/.
MLA Style (9th ed.)
"Platitude: an idea (a) that is admitted to be true by everyone, and (b) that is not true." FixQuotes, 18 Jan. 2026, https://fixquotes.com/quotes/platitude-an-idea-a-that-is-admitted-to-be-true-19532/. Accessed 13 Feb. 2026.














