The fanatic is generally an intellectual person. He is vehement and extreme, not for the sake of a vice or a pleasure, but for the sake of an opinion or a doctrine. His ungoverned temper does not commonly spring out of sensual appetites and indulgences. On the contrary, his blood is usually cold and thin, and his life abstemious and ascetical. But his passion runs to his brain. He holds an intellectual opinion or an intellectual conviction that is but a half-truth, with a spasmodic energy; and the consequence is, that he is swift to anger, and reckless of consequences in that direction. https://thepilgrimjournal.com/christian-moderation/