Idiot meant originally a private person, one not engaged in any public office. Hence Jeremy Taylor says,
"Humility is a duty in great ones, as well as in idiots" (private persons). The Greeks have the expressions,
"a priest or an idiot" (layman), "a poet or an idiot" (prose-writer). As idiots were not employed in public
offices, the term became synonymous with incompetency to fulfil the duties thereof. (Greek, idiotes.)
(See Baron.)