(b) Man is kept from sin, next, by the light God gives him to know the truth and by the grace He diffuses that all may perform good. Hence, resistance to the known truth and displeasure at the progress of God’s kingdom are also sins against the Spirit of truth and holiness.
(c) Man is kept from sin by the shamefulness of sin itself and the nothingness of the passing satisfaction it affords; for the former inclines him to be ashamed of sin committed, or to repent, while the latter tends to make him tire of sin and give it up. Hence, the resolve not to grieve over sin and obstinate adherence to such a resolve are also sins against the Holy Ghost.
900. There is no sin which, if repented of, cannot be forgiven in this life. How then does our Lord say that the blasphemy against the Holy Spirit shall not be forgiven, neither in this world nor in the world to come (Matt., xii. 31)?
(a) The sins against the Holy Ghost are unpardonable according to their nature, just as some diseases are incurable according to their nature, because not only do they set up an evil condition, but they also remove or resist those things that could lead to betterment. Thus, if one despairs, or presumes, or resists truth or good, or determines not to abandon error or evil, one shuts out the remedy of repentance, which is necessary for pardon; whereas, if one sins through passion or ignorance, faith and hope remain and help one to repentance.
(b) The sins against the Holy Ghost are not unpardonable, if we consider the omnipotence of God. Just as God can cure miraculously a disease that is humanly incurable, so can He pardon a sin which, according to its nature, is unpardonable; for He is able to bring hope and repentance to those who were in despair, for example. Hence, we repeat, there is no sin which, if repented of, cannot be forgiven in this life.
901. Does one arrive at the state of malicious sin or blasphemy suddenly or gradually? (a) Malice in sin (i.e., the willing choice of evil by one who is not weakened by ignorance or passion) is sometimes due to a disorder in the will itself which has a strong inclination towards wrong, as when long-continued habit has made sin attractive. It is clear that in such cases one does not arrive at blasphemy suddenly, Example: Titus blasphemes with readiness and without remorse. This argues that he is an adept and not a beginner, for readiness and strong attachment are signs of practice. (b) Malice in sin is sometimes due to the fact that the will has lost certain protections against sin, and hence chooses sin readily and gladly, as happens when a sin against the Holy Ghost has been committed. Generally, the contempt of God’s gifts contained in sins against the Holy Ghost does not come suddenly, but follows as the climax of a progressive deterioration (Prov., xviii. 3); but, since man is free and sin very alluring, it is not impossible that one should suddenly become a blasphemer, especially if one had not been careful before in other matters. It is next to impossible, however, that a religious-minded man should all at once become a blasphemer or malicious sinner.
902. Remedies Against Blasphemy.—(a) Those who blaspheme maliciously should be admonished of the enormity of their sin, as well as the absurdity of defying the Almighty (Ps. ii. 1, 4). Prayers and ejaculations in praise of God are a suitable penance for them. (b) Those who blaspheme through habit or out of sudden anger or passion should be told that at least they cause great scandal, and make themselves ridiculous. A good practice for overcoming habit or sudden outbursts is that some mortification or almsdeed or litany should be performed each time blasphemy is uttered.
903. Absolution of Blasphemers.—(a) If blasphemy is not heretical, no censure or reservation is incurred under the general law, and every confessor may absolve; (b) if blasphemy is heretical, excommunication is incurred under the conditions given above in 834, and absolution may be granted as explained there.
904. Sins of Ignorance, Blindness, Dullness.—After the sins against faith itself come the sins against the Gifts of the Holy Ghost that serve faith (see 808): (a) against the Gift of Knowledge is the sin of ignorance; (b) against the Gift of Understanding are the sins of blindness of heart and dullness of understanding.
905. Ignorance (as explained in 28 and 249) is a cause of sin—of material sin, if the ignorance is antecedent, of formal sin, if the ignorance is consequent. But ignorance is also a sin itself, in the sense now to be explained.