CCC 1864

"Whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin."¹³⁶ Mk 3:29; cf. Mt 12:32; Lk 12:10. There are no limits to the mercy of God, but anyone who deliberately refuses to accept his mercy by repenting, rejects the forgiveness of his sins and the salvation offered by the Holy Spirit.¹³⁷ Cf. John Paul II, DeV 46. Such hardness of heart can lead to final impenitence and eternal loss.