The systematic study and theory of heresies, including their causes, characteristics, and historical significance.
From Greek hairesis (heresy, choice, sect) + -logia (study, discourse). Developed as a formal academic discipline in the 17th-18th centuries alongside other specialized branches of theology, reflecting the scholarly impulse to systematize knowledge.
Heresiology reveals something fascinating: what one era calls heresy another era calls orthodoxy—studying heresies is really about studying how power shapes which beliefs are declared 'right' versus 'wrong.'
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