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."
Martha Wall
I have come to see that buying toys or ice cream or dog food is not sin. The sin lies in permitting Christians to remain victims of a warped sense of values that is impoverishing their own lives and robbing them of a great inheritance [in Heaven]... It is sin to allow earnest young Christians to plan mediocre lives around a materialistic ideal without challenging them to battle. We sin if we do not offer to lead the charge! God has sent us [missionaries] into a stirring conflict, one that should stir response in the blood of every Christian...God holds us responsible for advance!