Sanity (from Latin: sānitās) refers to the soundness, rationality, and health of the human mind, as opposed to insanity.
A sane mind is nowadays considered healthy both from its analytical - once called rational - and emotional aspects.
[1] According to the writer G. K. Chesterton,[2] sanity involves wholeness, whereas insanity implies narrowness and brokenness.
Psychiatrist Philip S. Graven suggested the term "un-sane" to describe a condition that is not exactly insane, but not quite sane either.
Furthermore, as Korzybski[10] has pointed out repeatedly, insanity to various degrees is widespread in the general population, which includes many people that are considered mentally fit in medical and legal terms.
In this connection, Erich Fromm[11] referred to the "pathology of normalcy," while David Cooper proposed that normality was opposed to both madness and sanity.