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Duke Cenez, duke Theman, duke Mabsar,
When contrasted to being cold, as in Revelation 3:15, being 'Hot' signifies being in a state of spiritual love.
In other places, e.g. where someone's temper is "hot", it can mean evil that's stemming from false doctrine, as in Deuteronomy 19:6.
(Referenties: Apocalypse Explained 231)