Therefore we must say simply that, in this life, every sin can be blotted out by true Penance.
Reply Obj. 1: Esau did not truly repent. This is evident from his saying (Gen. 27:41): "The days will come of the mourning of my father, and I will kill my brother Jacob." Likewise neither did Antiochus repent truly; since he grieved for his past sin, not because he had offended God thereby, but on account of the sickness which he suffered in his body.
Reply Obj. 2: These words of Augustine should be understood thus: "So great is the stain of that sin, that man is unable to humble himself in prayer," i.e. it is not easy for him to do so; in which sense we say that a man cannot be healed, when it is difficult to heal him. Yet this is possible by the power of God's grace, which sometimes turns men even "into the depths of the sea" (Ps. 67:23).
Reply Obj. 3: The word or blasphemy spoken against the Holy Ghost is final impenitence, as Augustine states (De Verb. Dom. xi), which is altogether unpardonable, because after this life is ended, there is no pardon of sins. Or, if by the blasphemy against the Holy Ghost, we understand sin committed through certain malice, this means either that the blasphemy itself against the Holy Ghost is unpardonable, i.e. not easily pardonable, or that such a sin does not contain in itself any motive for pardon, or that for such a sin a man is punished both in this and in the next world, as we explained in the Second Part (III, Q. 14, A. 3). _______________________
SECOND ARTICLE [III, Q. 86, Art. 2]
Whether Sin Can Be Pardoned Without Penance?
Objection 1: It would seem that sin can be pardoned without Penance.
For the power of God is no less with regard to adults than with
regard to children. But He pardons the sins of children without
Penance. Therefore He also pardons adults without penance.
Obj. 2: Further, God did not bind His power to the sacraments. But Penance is a sacrament. Therefore by God's power sin can be pardoned without Penance.
Obj. 3: Further, God's mercy is greater than man's. Now man sometimes forgives another for offending him, without his repenting: wherefore our Lord commanded us (Matt. 5:44): "Love your enemies, do good to them that hate you." Much more, therefore, does God pardon men for offending him, without their repenting.
On the contrary, The Lord said (Jer. 18:8): "If that nation . . . shall repent of their evil" which they have done, "I also will repent of the evil that I have thought to do them," so that, on the other hand, if man "do not penance," it seems that God will not pardon him his sin.