Eternal sin
In Catholic teaching there are six sins that blaspheme against the Holy Spirit. They are: Several passages in the Bible are frequently interpreted as referring to the unforgivable sin:
Contrition
A central concept in much of Christianity, contrition is regarded as the first step, through Christ, towards reconciliation with God. It consists of repentance for all one's sins, a desire for God over sin, and faith in Christ's redemption on the cross and its sufficiency for salvation (see regeneration and "ordo salutis"). It is widely referred to throughout the Bible, e.g. Ezekiel 33:11, Psalms 6:7ff, Psalm 51:1–12, Luke 13:5, Luke 18:9–13, and the well-known parable of the prodigal son (Luke 15:11–32).