Eternal sin
In Christian hamartiology, eternal sins, unforgivable sins, or unpardonable sins are sins which will not be forgiven by God. One eternal or unforgivable sin (blasphemy against the Holy Spirit) is specified in several passages of the Synoptic Gospels, including , , and .
Forgiveness
Forgiveness is central to Christian ethics and is a frequent topic in sermons and theological works. Considering Mark 11:25, and , that follows the Lord's Prayer, "For if you forgive men when they sin against you, your heavenly Father will also forgive you. But if you do not forgive men their sins, your Father will not forgive your sins.," Forgiveness is not an option to a Christian, rather one must forgive to be a Christian. Forgiveness in Christianity is a manifestation of submission to Christ and fellow believers.