HKB
is "envy of a brother's spiritual good," when, namely, a man is envious not only of his brother's person, but also of the increase of Divine grace in the world.
On the part of sin, there are two things which may withdraw man therefrom: one is the inordinateness and shamefulness of the act, the consideration of which is wont to arouse man to repentance for the sin he has committed, and against this there is "impenitence," not as denoting permanence in sin until death, in which sense it was taken above (for thus it would not be a special sin, but a circumstance of sin), but as denoting the purpose of not repenting. The other thing is the smallness or brevity of the good which is sought in sin, according to Rom. 6:21: "What fruit had you therefore then in those things, of which you are now ashamed?" The consideration of this is wont to prevent man's will from being hardened in sin, and this is removed by "obstinacy," whereby man hardens his purpose by clinging to sin. Of these two it is written (Jer. 8:6): "There is none that doth penance for his sin, saying: What have I done?" as regards the first; and, "They are all turned to their own course, as a horse rushing to the battle," as regards the second.
Reply Obj. 1: The sins of despair and presumption consist, not in disbelieving in God's justice and mercy, but in contemning them.
Reply Obj. 2: Obstinacy and impenitence differ not only in respect of past and future time, but also in respect of certain formal aspects by reason of the diverse consideration of those things which may be considered in sin, as explained above.
Reply Obj. 3: Grace and truth were the work of Christ through the gifts of the Holy Ghost which He gave to men.
Reply Obj. 4: To refuse to obey belongs to obstinacy, while a feigned repentance belongs to impenitence, and schism to the envy of a brother's spiritual good, whereby the members of the Church are united together.
THIRD ARTICLE [II-II, Q. 14, Art. 3]
Whether the Sin Against the Holy Ghost Can Be Forgiven?
Objection 1: It would seem that the sin against the Holy Ghost can be forgiven. For Augustine says (De Verb. Dom., Serm. lxxi): "We should despair of no man, so long as Our Lord's patience brings him back to repentance." But if any sin cannot be forgiven, it would be possible to despair of some sinners. Therefore the sin against the Holy Ghost can be forgiven.
Obj. 2: Further, no sin is forgiven, except through the soul being healed by God. But "no disease is incurable to an all-powerful physician," as a gloss says on Ps. 102:3, "Who healeth all thy diseases." Therefore the sin against the Holy Ghost can be forgiven.
Obj. 3: Further, the free-will is indifferent to either good or evil. Now, so long as man is a wayfarer, he can fall away from any virtue, since even an angel fell from heaven, wherefore it is written (Job 4:18, 19): "In His angels He found wickedness: how much more shall they that dwell in houses of clay?" Therefore, in like manner, a man can return from any sin to the state of justice. Therefore the sin against the Holy Ghost can be forgiven.
On the contrary, It is written (Matt. 12:32): "He that shall speak against the Holy Ghost, it shall not be forgiven him, neither in this world, nor in the world to come": and Augustine says (De Serm. Dom. in Monte i, 22) that "so great is the downfall of this sin that it cannot submit to the humiliation of asking for pardon."