He sendeth down the rain from Heaven: then flow the torrents in their due measure, and the flood beareth along a swelling foam. And from the metals which are molten in the fire for the sake of ornaments or utensils, a like scum ariseth. In this way doth God depict (set forth) truth and falsehood. As to the foam, it is quickly gone: and as to what is useful to man, it remaineth on the earth. Thus doth God set forth comparisons!