A corrupt BREATH stains a clear glass

Meaning & Analysis

Foul breath will cloud or spot a clean pane or mirror.

Insights

Defamation taints reputation

Malicious speech—the ‘corrupt breath’ of slander or rumor—smears a clear ‘glass,’ the public image of a person or community, making what was transparent seem dirty.

Moral contagion

Vice exhaled nearby pollutes what is sound; corrupt influence, like foul air, discolors adjacent purity without needing force.

Judgment obscured

Flattery, lies, or heated rhetoric fog the mind’s ‘lens,’ dimming perception so facts appear warped or murky.

Fragility of purity

The proverb warns that clarity—of character, glass, or conscience—is easily marred by small, close impurities and thus requires vigilant care.

Pneuma and speech

Historically ‘breath’ is both air and utterance (spiritus/pneuma); the line fuses physiology and ethics to say that what we exhale—words or humors—reveals and spreads inward rot.

Miasma imagination

Before germ theory, foul airs were thought to carry illness; the proverb leverages that intuition to depict moral or social pollution as an airborne stain.

Glass as fame and conscience

Glass signifies both public face (mirror of reputation) and the inner faculty of reflection; in either sense, corrupt output from mouths can quickly mar what should stay clear.

Asymmetry of harm

It takes effort to clean glass but only a breath to fog it; likewise reputations and sound judgments require long cultivation yet are easily smudged by casual talk.

Proximity ethics

The stain arises at close range, implying that intimates—courtiers, friends, advisors—can do the most subtle harm through whispered corruption.

Rhetorical Devices

Metaphor

Maps ‘breath’ to speech/influence and ‘glass’ to reputation or judgment, turning abstract social harm into a visible smudge.

Antithesis

Sets ‘corrupt’ against ‘clear’ to heighten the violation of purity by impurity.

Synecdoche

‘Breath’ stands for the speaker’s moral state; ‘glass’ for the whole self-image or communal regard.

Alliteration

The b/g consonance (‘breath’/‘glass’) adds a crisp, memorable snap to the warning.

Aphoristic compression

Short, image-rich phrasing makes the moral instantly graspable and portable.

speechreputationcontagionpurityslanderjudgment
Analyzed with gpt-5.0-thinking on November 14, 2025

Transcription

Quotations

1616, DR., Infection, no. 1103
1639, CL., Morum contagio, p. 217

Original Scan

A corrupt BREATH stains a clear glass - a scanned entry from Tilley's 1950 Dictionary of Proverbs.
Scan courtesy of HathiTrust Digital Library.
Used under CC BY-NC 3.0.

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Last updated: January 27, 2026