14 But I say all this now, and select all the histories that contain trials and tribulations, and the wrath of kings, and their evil designs, in order that we may fear nothing, save only offending God. For then also was there a furnace burning; yet they derided it, but feared sin. For they knew that if they were consumed in the fire, they should suffer nothing that was to be dreaded; but that if they were guilty of impiety, they should undergo the extremes of misery.
It is the greatest punishment to commit sin, though we may remain unpunished; as on the other hand, it is the greatest honour and repose to live virtuously, though we may be punished. For sins separate us from God; as He Himself speaks; “Have not your sins separated between you and Me?” But punishments lead us back to God. As one says, “Give peace; for You have recompensed us for all things.” Suppose any one has a wound; which is the most deserving of fear, gangrene, or the surgeon's knife?
The steel, or the devouring progress of the ulcer? Sin is a gangrene, punishment is the surgeon's knife. As then, he who has a gangrene, although he is not lanced, has to sustain the malady, and is then in the worse condition, when he is not lanced; so also the sinner, though he be not punished, is the most wretched of men; and is then especially wretched, when he has no punishment, and is suffering no distress. And as those who have a disease of the spleen, or a dropsy, when they enjoy a plentiful table, and cool drinks, and a variety of delicacies, and condiments, are then especially in a most pitiable state, increasing as they do their disease by luxury; but should they rigorously subject themselves to hunger and thirst, according to medical laws, they might have some hope of recovery; so also those who live in iniquity, if they are punished, may have favourable hopes; but if, together with their wickedness, they enjoy security and luxury, they become more wretched than those who cram their bellies, though they are in a state of dropsy; and so much the more, as the soul is better than the body.
If then you see any who are in the same sins, and some of them struggling continually with hunger, and a thousand ills; while others are drinking their fill, and living sumptuously, and gormandizing; think those the better off, who endure sufferings. For not only is the flame of voluptuousness cut off by these misfortunes, but they also depart to the future Judgment, and that dread tribunal, with no small relief; and go hence, having discharged here the penalty of the greater part of their sins by the ills they have suffered.
Source: Homilies on the Statues (New Advent)