The Sin against the Holy Ghost

Who sins against the Holy Ghost? Simply, one who does not believe  the Gospel. For although Christ's death forgives the sins of all against him (as he says here), those who refuse to believe his word on this cannot be helped, and they shall not be forgiven for that. Therefore let us hear, and hearing, let us believe, and we shall be saved. Sermon for Trinity XII midweek, on St. Matthew 12.