*“All sins will be forgiven the sons of men, and whatever blasphemies they utter; but whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin”. * Mark 3:29
All sins are forgivable with repentance. The “unforgivable sin”(Matthew 12:31-32) of blasphemy against the Holy Spirit is a sin committed by one who knowingly and willingly rejects the grace of conversion in this life. If one dies in this self-imposed state of unrepentance, he cannot be saved.
“Blasphemy against the Holy Spirit, then, is the sin committed by the person who claims to have a “right” to persist in evil—in any sin at all—and who thus rejects Redemption. One closes oneself up in sin, thus making impossible one’s conversion, and consequently the remission of sins, which one considers not essential or not important for one’s life. This is a state of spiritual ruin, because blasphemy against the Holy Spirit does not allow one to escape from one’s self-imposed imprisonment and open oneself to the divine sources of the purification of consciences and of the remission of sins.”
Why is blasphemy against the Holy Spirit unforgivable? How should this blasphemy be understood? Saint Thomas Aquinas replies that it is a question of a sin that is “unforgivable by its very nature”, insofar as it excludes the elements through which the forgiveness of sin takes place.
According to such an exegesis, “blasphemy” does not properly consist in offending against the Holy Spirit in words; it consists rather in the refusal to accept the salvation which God offers to man through the Holy Spirit, working through the power of the Cross.
And the blasphemy against the Holy Spirit consists precisely in the radical refusal to accept this forgiveness of which he is the intimate giver and which presupposes the genuine conversion which he brings about in the conscience. If Jesus says that blasphemy against the Holy Spirit cannot be forgiven either in this life or in the next, it is because this “non-forgiveness” is linked, as to its cause, to “non-repentance”, in other words to the radical refusal to be converted.”
Dominum Et Vivificantem