Whether sin can be the punishment of sin?
Objection 1: It would seem that sin cannot be the punishment of sin. For the purpose of punishment is to bring man back to the good of virtue, as the Philosopher declares (Ethic. x, 9). Now sin does not bring man back to the good of virtue, but leads him in the opposite direction. Therefore sin is not the punishment of sin.
Objection 2: Further, just punishments are from God, as Augustine says (Qq. lxxxiii, qu. 82). But sin is not from God, and is an injustice. Therefore sin cannot be the punishment of sin.
Objection 3: Further, the nature of punishment is to be something against the will. But sin is something from the will, as shown above (Q 74, AA 1 ,2). Therefore sin cannot be the punishment of sin.
On the contrary, Gregory speaks (Hom. xi in Ezech.) that some sins are punishments of others.
I answer that, We may speak of sin in two ways: first, in its essence, as such; secondly, as to that which is accidental thereto. Sin as such can nowise be the punishment of another. Because sin considered in its essence is something proceeding from the will, for it is from this that it derives the character of guilt. Whereas punishment is essentially something against the will, as stated in the FP, Q 48, A 5. Consequently it is evident that sin regarded in its essence can nowise be the punishment of sin.
On the other hand, sin can be the punishment of sin accidentally in three ways. First, when one sin is the cause of another, by removing an impediment thereto. For passions, temptations of the devil, and the like are causes of sin, but are impeded by the help of Divine grace which is withdrawn on account of sin. Wherefore since the withdrawal of grace is a punishment, and is from God, as stated above (Q 79, A 3), the result is that the sin which ensues from this is also a punishment accidentally. It is in this sense that the Apostle speaks (Rom. 1:24) when he says: "Wherefore God gave them up to the desires of their heart," i.e. to their passions; because, to wit, when men are deprived of the help of Divine grace, they are overcome by their passions. In this way sin is always said to be the punishment of a preceding sin. Secondly, by reason of the substance of the act, which is such as to cause pain, whether it be an interior act, as is clearly the case with anger or envy, or an exterior act, as is the case with one who endures considerable trouble and loss in order to achieve a sinful act, according to Wis. 5:7: "We wearied ourselves in the way of iniquity." Thirdly, on the part of the effect, so that one sin is said to be a punishment by reason of its effect. In the last two ways, a sin is a punishment not only in respect of a preceding sin, but also with regard to itself.
Reply to Objection 1: Even when God punishes men by permitting them to fall into sin, this is directed to the good of virtue. Sometimes indeed it is for the good of those who are punished, when, to wit, men arise from sin, more humble and more cautious. But it is always for the amendment of others, who seeing some men fall from sin to sin, are the more fearful of sinning. With regard to the other two ways, it is evident that the punishment is intended for the sinner's amendment, since the very fact that man endures toil and loss in sinning, is of a nature to withdraw man from sin.
Reply to Objection 2: This objection considers sin essentially as such: and the same answer applies to the Third Objection.
I–II · Q. 87, Art. 3: Whether any sin incurs a debt of eternal punishment?
Whether any sin incurs a debt of eternal punishment?
Objection 1: It would seem that no sin incurs a debt of eternal punishment. For a just punishment is equal to the fault, since justice is equality: wherefore it is written (Is. 27:8): "In measure against measure, when it shall be cast off, thou shalt judge it." Now sin is temporal. Therefore it does not incur a debt of eternal punishment.
Objection 2: Further, "punishments are a kind of medicine" (Ethic. ii, 3). But no medicine should be infinite, because it is directed to an end, and "what is directed to an end, is not infinite," as the Philosopher states (Polit. i, 6). Therefore no punishment should be infinite.
Objection 3: Further, no one does a thing always unless he delights in it for its own sake. But "God hath not pleasure in the destruction of men" [Vulg.: 'of the living']. Therefore He will not inflict eternal punishment on man.
Objection 4: Further, nothing accidental is infinite. But punishment is accidental, for it is not natural to the one who is punished. Therefore it cannot be of infinite duration.
On the contrary, It is written (Mat. 25:46): "These shall go into everlasting punishment"; and (Mk. 3:29): "He that shall blaspheme against the Holy Ghost, shall never have forgiveness, but shall be guilty of an everlasting sin."
I answer that, As stated above (A 1), sin incurs a debt of punishment through disturbing an order. But the effect remains so long as the cause remains. Wherefore so long as the disturbance of the order remains the debt of punishment must needs remain also. Now disturbance of an order is sometimes reparable, sometimes irreparable: because a defect which destroys the principle is irreparable, whereas if the principle be saved, defects can be repaired by virtue of that principle. For instance, if the principle of sight be destroyed, sight cannot be restored except by Divine power; whereas, if the principle of sight be preserved, while there arise certain impediments to the use of sight, these can be remedied by nature or by art. Now in every order there is a principle whereby one takes part in that order. Consequently if a sin destroys the principle of the order whereby man's will is subject to God, the disorder will be such as to be considered in itself, irreparable, although it is possible to repair it by the power of God. Now the principle of this order is the last end, to which man adheres by charity. Therefore whatever sins turn man away from God, so as to destroy charity, considered in themselves, incur a debt of eternal punishment.
Reply to Objection 1: Punishment is proportionate to sin in point of severity, both in Divine and in human judgments. In no judgment, however, as Augustine says (De Civ. Dei xxi, 11) is it requisite for punishment to equal fault in point of duration. For the fact that adultery or murder is committed in a moment does not call for a momentary punishment: in fact they are punished sometimes by imprisonment or banishment for life---sometimes even by death; wherein account is not taken of the time occupied in killing, but rather of the expediency of removing the murderer from the fellowship of the living, so that this punishment, in its own way, represents the eternity of punishment inflicted by God. Now according to Gregory (Dial. iv, 44) it is just that he who has sinned against God in his own eternity should be punished in God's eternity. A man is said to have sinned in his own eternity, not only as regards continual sinning throughout his whole life, but also because, from the very fact that he fixes his end in sin, he has the will to sin, everlastingly. Wherefore Gregory says (Dial. iv, 44) that the "wicked would wish to live without end, that they might abide in their sins for ever."
Reply to Objection 2: Even the punishment that is inflicted according to human laws, is not always intended as a medicine for the one who is punished, but sometimes only for others: thus when a thief is hanged, this is not for his own amendment, but for the sake of others, that at least they may be deterred from crime through fear of the punishment, according to Prov. 19:25: "The wicked man being scourged, the fool shall be wiser." Accordingly the eternal punishments inflicted by God on the reprobate, are medicinal punishments for those who refrain from sin through the thought of those punishments, according to Ps. 59:6: "Thou hast given a warning to them that fear Thee, that they may flee from before the bow, that Thy beloved may be delivered."
Reply to Objection 3: God does not delight in punishments for their own sake; but He does delight in the order of His justice, which requires them.
Reply to Objection 4: Although punishment is related indirectly to nature, nevertheless it is essentially related to the disturbance of the order, and to God's justice. Wherefore, so long as the disturbance lasts, the punishment endures.