Eternal sin
However, the Church further believes there is no offence, however serious, that cannot be taken away by Baptism, or absolved from in the Confessional—that no one, however wicked and guilty, may not confidently hope for forgiveness. The Catechism says that Christ desires "the gates of forgiveness should always be open to anyone who turns away from sin." As did St Augustine, the Catholic Church today teaches that only dying unrepentant for one's sins is the only unforgivable sin. Indeed, in "Dominum et vivificantem" Pope John Paul II writes "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 "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. This means the refusal to come to the sources of Redemption, which nevertheless remain "always" open in the economy of salvation in which the mission of the Holy Spirit is accomplished."
Apostasy in Christianity
The Epistle to the Hebrews is the classic text on the subject of apostasy in the New Testament. New Testament scholar Scot McKnight argues that the warning passages (2:1–4; 3:7–4:13; 5:11–6:12; 10:19–39; 12:1–29) should be read and interpreted "as an organic whole, each of which expresses four components of the author’s message." These four components are "(1) the subjects or audience in danger of committing the sin, (2) the sin that leads to (3) the exhortation, which if not followed, leads to (4) the consequences of that sin." McKnight concluded from his study that (1) the subjects of this letter were genuine "believers, persons who . . . had converted to Jesus Christ,” (2) The sin "is apostasy, a deliberate and public act of deconfessing Jesus Christ, a rejection of God's Spirit, and a refusal to submit to God and His will," (3) the exhortation is "to a persevering faithfulness to God and his revelation of the new covenant in Jesus Christ," (4) the consequences involve "eternal damnation if a person does not persevere in the faith." B. J. Oropeza concludes that apostasy threatens the community in Hebrews on two fronts: mistreatment by outsiders (persecution) and malaise involving reluctance to listen to godly exhortation.