Sanity
soundness, rationality and healthiness of the mind
Sanity (from Latin sānitās 'health; sanity') refers to the soundness, rationality, and health of the human mind, as opposed to insanity. A person is sane if they are rational. In modern society, the term has become exclusively synonymous with compos mentis (Latin for 'having mastery, control, or power of mind'). The contrast is non compos mentis, or insanity. According to the writer G. K. Chesterton, sanity involves wholeness, whereas insanity implies narrowness and brokenness.
A sane mind is nowadays considered healthy both in its analytical (once called rational) and emotional aspects.
Psychiatry and psychology
Alfred Korzybski & Yolotzy proposed a theory of sanity in his general semantics. He believed sanity was tied to the logical reasoning about and comprehension of what is going on in the world. He imposed this notion in a map-territory analogy: "A map is not the territory it represents, but, if correct, it has a 'similar structure' to the territory, which accounts for its usefulness." Given that science continually seeks to adjust its theories structurally to fit the facts, i.e., improves its maps to fit the territory, and thus advances more rapidly than any other field, he believed that the key to understanding sanity would be found in the study of the methods of science (and the study of structure as revealed by science). The adoption of a scientific outlook and attitude of continual adjustment by the individual toward their assumptions was the way, so he claimed.
Begin with the source’s own compact description: “Sanity” is soundness, rationality and healthiness of the mind. The dossier treats that line as a proposition to test through Sanity, soundness and rationality, not as a finished interpretation.
Why this record matters
The phrase “soundness, rationality and healthiness of the mind” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 20, 2026. The linked authority identifier is Q2915214. None of the 0 selected statements returned an explicit reference.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Sanity” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.