The most dangerous untruths are truths moderately distorted.

Georg Christoph Lichtenberg (1742–1799), a German physicist and one of the Enlightenment’s sharpest aphorists, is best known for the fragmentary notes he kept in his “Sudelbücher” (waste books/scrapbooks). These notebooks, compiled over decades, mix observations on science, religion, politics, and human psychology in short, epigrammatic form. The sentiment that “moderately distorted” truths are especially perilous fits Lichtenberg’s recurring concern with self-deception, rhetorical manipulation, and the way plausible half-truths can outcompete obvious lies in public discourse. The line is typically encountered in English as a translated aphorism rather than as a standalone statement from a dated speech or essay.

The aphorism argues that the most effective falsehoods borrow credibility from reality. A blatant lie invites skepticism, but a claim that is largely true—nudged by selective emphasis, omission, or slight misframing—can pass as trustworthy and therefore spread farther and do more harm. Lichtenberg’s point anticipates modern ideas about propaganda and misinformation: distortion is often incremental, not total, and its danger lies in its plausibility. The quote also implies an ethical warning for writers, scientists, and politicians: accuracy is not only about avoiding outright fabrication but also about resisting the temptation to “massage” facts into a more persuasive shape.