ANSWER: "Every one" is not every person, but every one who "is cast into Gehenna," as in the preceding context. The fire is the penal fire of the obdurate sinner who under punishment is not annihilated, but preserved as salt preserves meat. God's love reciprocated gladdens forever; rejected it torments forever, for it will never change. The lost soul can never be indifferent to it, hence its misery.
— Steele's Answers p. 263.