"He sends down water from the skies, and the channels flow, each according to its measure: But the torrent bears away to foam that mounts up to the surface. Even so, from that [ore] which they heat in the fire, to make ornaments or utensils therewith, there is a scum likewise. Thus doth Allah [by parables] show forth Truth and Vanity. For the scum disappears like forth cast out; while that which is for the good of mankind remains on the earth. Thus doth Allah set forth parables."— Yusuf Ali translation