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.
Sin of omission
Paul the Apostle refers to this sin directly when he states "For I do not do the good I want ..." (Romans ).
James the brother of Jesus more exactly defines this sin when he states, "Whoever knows the right thing to do and fails to do it, for him it is sin." (James )