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For other uses, see Sanity (disambiguation).
"Sound mind" redirects here. For the phrase "sound mind in a sound body", see Mens sana in corpore sano.
Sanity (from Latin: sānitās) refers to the soundness, rationality and healthiness of the human mind, as opposed to insanity. A person is sane if they are rational. In modern society, the terms have become exclusively synonymous with compos mentis (Latin: compos, having mastery of, and mentis, mind), in contrast with non compos mentis, or insane, meaning troubled conscience.