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.
The New Church (Swedenborgian)
Remission of sins is their removal after repentance. The New Church differs from older Christian churches on this point. "The belief that the passion of the cross was redemption itself is a fundamental error of the church; and that error, together with the error concerning three Divine persons from eternity, has perverted the whole church, so that nothing spiritual is left in it." The crucifixion was the last temptation endured by Jesus.