Eternal sin
Thomas Aquinas lists, or has responded to, six sins that supposedly go against the Holy Spirit:
Thomas Aquinas explains that the unforgivability of blasphemy against the Holy Spirit means that it removes the entrance to these means of salvation; however, it cannot hinder God in taking away this obstacle by way of a miracle.
Christian views on sin
Another group of four or five sins distinguished by the Church are the sins that cry to heaven: murder, sodomy, (oppression of a people,) oppression of the weak and defrauding the laborer.