Reply to Objection 3: There are two ways in which blasphemy may occur unawares and without deliberation. In the first way, by a man failing to advert to the blasphemous nature of his words, and this may happen through his being moved suddenly by passion so as to break out into words suggested by his imagination, without heeding to the meaning of those words: this is a venial sin, and is not a blasphemy properly so called. In the second way, by adverting to the meaning of his words, and to their blasphemous nature: in which case he is not excused from mortal sin, even as neither is he who, in a sudden movement of anger, kills one who is sitting beside him.
Whether the sin of blasphemy is the greatest sin?
Objection 1: It would seem that the sin of blasphemy is not the greatest sin. For, according to Augustine (Enchiridion xii), a thing is said to be evil because it does harm. Now the sin of murder, since it destroys a man's life, does more harm than the sin of blasphemy, which can do no harm to God. Therefore the sin of murder is more grievous than that of blasphemy.
Objection 2: Further, a perjurer calls upon God to witness to a falsehood, and thus seems to assert that God is false. But not every blasphemer goes so far as to say that God is false. Therefore perjury is a more grievous sin than blasphemy.
Objection 3: Further, on Ps. 74:6, "Lift not up your horn on high," a gloss says: "To excuse oneself for sin is the greatest sin of all." Therefore blasphemy is not the greatest sin.
On the contrary, On Is. 18:2, "To a terrible people," etc. a gloss says: "In comparison with blasphemy, every sin is slight."
I answer that, As stated above (A[1]), blasphemy is opposed to the confession of faith, so that it contains the gravity of unbelief: while the sin is aggravated if the will's detestation is added thereto, and yet more, if it breaks out into words, even as love and confession add to the praise of faith.
Therefore, since, as stated above (Q[10], A[3]), unbelief is the greatest of sins in respect of its genus, it follows that blasphemy also is a very great sin, through belonging to the same genus as unbelief and being an aggravated form of that sin.
Reply to Objection 1: If we compare murder and blasphemy as regards the objects of those sins, it is clear that blasphemy, which is a sin committed directly against God, is more grave than murder, which is a sin against one's neighbor. On the other hand, if we compare them in respect of the harm wrought by them, murder is the graver sin, for murder does more harm to one's neighbor, than blasphemy does to God. Since, however, the gravity of a sin depends on the intention of the evil will, rather than on the effect of the deed, as was shown above (FS, Q[73], A[8]), it follows that, as the blasphemer intends to do harm to God's honor, absolutely speaking, he sins more grievously that the murderer. Nevertheless murder takes precedence, as to punishment, among sins committed against our neighbor.
Reply to Objection 2: A gloss on the words, "Let . . . blasphemy be put away from you" ( Eph. 4:31 ) says: "Blasphemy is worse than perjury." The reason is that the perjurer does not say or think something false about God, as the blasphemer does: but he calls God to witness to a falsehood, not that he deems God a false witness, but in the hope, as it were, that God will not testify to the matter by some evident sign.
Reply to Objection 3: To excuse oneself for sin is a circumstance that aggravates every sin, even blasphemy itself: and it is called the most grievous sin, for as much as it makes every sin more grievous.
Whether the damned blaspheme?
Objection 1: It would seem that the damned do not blaspheme. Because some wicked men are deterred from blaspheming now, on account of the fear of future punishment. But the damned are undergoing these punishments, so that they abhor them yet more. Therefore, much more are they restrained from blaspheming.
Objection 2: Further, since blasphemy is a most grievous sin, it is most demeritorious. Now in the life to come there is no state of meriting or demeriting. Therefore there will be no place for blasphemy.
Objection 3: Further, it is written ( Eccles. 11:3 ) that "the tree . . . in what place soever it shall fall, there shall it be": whence it clearly follows that, after this life, man acquires neither merit nor sin, which he did not already possess in this life. Now many will be damned who were not blasphemous in this life. Neither, therefore, will they blaspheme in the life to come.
On the contrary, It is written ( Apoc. 16:9 ): "The men were scorched with great heat, and they blasphemed the name of God, Who hath power over these plagues," and a gloss on these words says that "those who are in hell, though aware that they are deservedly punished, will nevertheless complain that God is so powerful as to torture them thus." Now this would be blasphemy in their present state: and consequently it will also be in their future state.
I answer that, As stated above (AA[1],3), detestation of the Divine goodness is a necessary condition of blasphemy. Now those who are in hell retain their wicked will which is turned away from God's justice, since they love the things for which they are punished, would wish to use them if they could, and hate the punishments inflicted on them for those same sins. They regret indeed the sins which they have committed, not because they hate them, but because they are punished for them. Accordingly this detestation of the Divine justice is, in them, the interior blasphemy of the heart: and it is credible that after the resurrection they will blaspheme God with the tongue, even as the saints will praise Him with their voices.
Reply to Objection 1: In the present life men are deterred from blasphemy through fear of punishment which they think they can escape: whereas, in hell, the damned have no hope of escape, so that, in despair, they are borne towards whatever their wicked will suggests to them.
Reply to Objection 2: Merit and demerit belong to the state of a wayfarer, wherefore good is meritorious in them, while evil is demeritorious. In the blessed, on the other hand, good is not meritorious, but is part of their blissful reward, and, in like manner, in the damned, evil is not demeritorious, but is part of the punishment of damnation.
Reply to Objection 3: Whoever dies in mortal sin, bears with him a will that detests the Divine justice with regard to a certain thing, and in this respect there can be blasphemy in him.