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.

❌ Objection 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.

❌ Objection 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.