Blasphemy against the Holy Spirit - The unforgivable sin?
It is the Holy Spirit which brings the pertinence of the Good News to the awareness of men. The Spirit is the agency by which the Good News comes freely ie, the Good News of forgiveness, of acceptance for Jesus sake.
The Spirit will try many times in many ways in a mans lifetime to woo him/ her. The Spirit is the Hound of Heaven. Refuse what has been freely given, reject it and one cuts off the only agency that brings Grace to us. Scripture calls it the sin against the HS. Each refusal progressively hardens mens hearts and the Spirit's voice becomes fainter and fainter, not because it is faint but because mens ears become dull of hearing and where else is there to go? One can call it unbelief, or rebellion or any other name one chooses to give to, no thanks.
The question is asked again, where else will a man go? The agency (HS) which brings the gift of Life freely has been dismissed, waylaid, rejected. By its very definition this is unpardonable. Not because God wont pardon but because the pardon given is pissed on and thrown away as a worthless thing. Death becomes inevitable. God doesn't kill him, he kills himself by wilful choice.
Deception involves a false spirit, ie one which pedals lies about Grace and about the Character of God. False spirits counterfeit God's gifts and misrepresent his Grace; they make it conditional on our activity.