It does not say in verse 2 that he is like a forest fire, or like an incinerator’s fire. It says that he is like a refiner’s fire. A forest fire destroys indiscriminately. An incinerator consumes completely. But verse 6 says, “I the Lord do not change; therefore you, O sons of Jacob, are not consumed — you are not destroyed.”
He is a refiner’s fire, and that makes all the difference. A refiner’s fire does not destroy indiscriminately like a forest fire. A refiner’s fire does not consume completely like the fire of an incinerator. A refiner’s fire refines. It purifies. It melts down the bar of silver or gold, separates out the impurities that ruin its value, burns them up, and leaves the silver and gold intact. He is like a refiner’s fire.
It does say fire. And therefore purity and holiness will always be a dreadful thing. There will always be a proper “fear and trembling” in the process of becoming pure… the passion for purity is never flippant. He is like fire and fire is serious. You don’t fool around with it.
…He is like a refiner’s fire. And therefore this is not merely a word of warning, but a tremendous word of hope. The furnace of affliction in the family of God is always for refinement, never for destruction.