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.
Catholic theology
Sinning according to the Greek word in scripture, "amartia", "falling short of the mark", succumbing to our imperfection: we always remain on the road to perfection.in this life. People can sin by failing to obey the Ten Commandments, failing to love God, and failing to love other people. Some sins are more serious than others, ranging from lesser, venial sins, to grave, mortal sins that sever a person's relationship with God.