4. We find in the prophet Isaiah, that the fire with which each one is punished is described as his own; for he says, “Walk in the light of your own fire, and in the flame which ye have kindled.”[319] By these words it seems to be indicated that every sinner kindles for himself the flame of his own fire, and is not plunged into some fire which has been already kindled by another, or was in existence before himself. Of this fire the fuel and food are our sins, which are called by the Apostle Paul wood, and hay, and stubble.[320] And I think that, as abundance of food, and provisions of a contrary kind and amount, breed fevers in the body, and fevers, too, of different sorts and duration, according to the proportion in which the collected poison[321] supplies material and fuel for disease (the quality of this material, gathered together from different poisons, proving the causes either of a more acute or more lingering disease); so, when the soul has gathered together a multitude of evil works, and an abundance of sins against itself, at a suitable time all that assembly of evils boils up to punishment, and is set on fire to chastisements; when the mind itself, or conscience, receiving by divine power into the memory all those things of which it had stamped on itself certain signs and forms at the moment of sinning, will see a kind of history, as it were, of all the foul, and shameful, and unholy deeds which it has done, exposed before its eyes: then is the conscience itself harassed, and, pierced by its own goads, becomes an accuser and a witness against itself. And this, I think, was the opinion of the Apostle Paul himself, when he said, “Their thoughts mutually accusing or excusing them in the day when God will judge the secrets of men by Jesus Christ, according to my gospel.”[322] From which it is understood that around the substance of the soul certain tortures are produced by the hurtful affections of sins themselves.