[90] But all these ideas are the invention of quibblers, who employ all their artifices in opposition to the truth. Why so? Because it is impossible, as has been proved already, that the world, after it has been destroyed by conflagration, should become similar to coal, inasmuch as there is a vast quantity of earthy substance left in which the fire must of necessity lie in ambush. And perhaps too the conflagration could not prevail in every quarter, if the heaviest and most invincible of the elements, namely the earth, still remains, without being dissolved; but it must of necessity change, either into flame or into light: into flame, as Cleanthes thought; into light, as Chrysippus conceived.