Zealotry is measurable as enthusiasm plus a mission to dominate

Evidence

The Zealot Scale. In 1991 I began trying to measure how fired up people were about whatever they believed in most. How enthused were they about their beliefs, their causes? Were they consumed by them? Did they have a mission to make them dominant? Did disagreement anger them? Did they have the solution to all our problems? Did they proselytize? In short, were they zealots? — Bob Altemeyer, The Authoritarian Specter, 2731

Categorization

• DEFINE: Operationalizes zealotry as combination of certainty, mission, anger at disagreement, and proselytizing.