Pyroō draws its force from pyr ('fire') and carries the full spectrum of fire's effects — destructive, purifying, and passionate. Paul uses it figuratively for burning with unfulfilled desire (1 Cor 7:9) and for the anguish of pastoral care (2 Cor 11:29). In Revelation, it becomes a metallurgical image: Christ's feet are like bronze 'refined in a furnace' (Rev 1:15), and he counsels Laodicea to buy gold 'refined by fire' (Rev 3:18). Spanish captures the distinction beautifully — quemarse for passionate burning versus refinado for purifying fire. The eschatological use in 2 Pet 3:12, where the heavens are 'set on fire,' returns to fire's raw destructive power.