Origen

“ But that we say that God brings fire upon the world, not like a cook, but like a God, who is the benefactor of them who stand in need of the discipline of fire, [5] will be testified by the prophet Isaiah, in whose writings it is related that a sinful nation was thus addressed: “Because thou hast coals of fire, sit upon them: they shall be to thee a help.” ”

“ And the holy Scriptures say that the Lord will, like a refiner’s fire and fullers’ soap, [3] visit each one of those who require purification, because of the intermingling in them of a flood of wicked matter proceeding from their evil nature; who need fire, I mean, to refine, as it were, (the dross of) those who are intermingled with copper, and tin, and lead. ”