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:
Western Christianity
Although "original sin" can be taken to mean the sin that Adam committed, it is usually understood as a consequence of the first sin, the hereditary stain with which we are born on account of our origin or descent from Adam.
With the exception of tendencies such as Pelagianism, Western Christianity is thought to hold this doctrine, which was championed especially by Saint Augustine, who wrote: "The deliberate sin of the first man is the cause of original sin" (De nupt. et concup., II, xxvi, 43).