I believe Chuck Smith has some good words for us on this matter of blasphemy of the Holy Spirit, following is a clip from a sermon of his:_________________________________________________Basically, it is the refusal to harken to the work of the Spirit within your life. For Jesus said," when the Spirit comes He is not going to testify of Himself, He is going to testify of me. And He is going to reprove the world of sin, of righteousness, and of judgment." And then He said, " of sin, because they do not believe on me." The work of the Holy Spirit is to convict men of sin by revealing to men the answer for his sin, even Jesus Christ. God has made only one provision for your forgiveness; only one provision for the putting away of your sin and your guilt, and that provision is in and through His only begotten Son. And the Spirit of God comes to bear witness to us of this fact that there is only one way you can have forgiveness of your sin, and that is by the receiving of the Son of God, Jesus Christ, as your Savior and Lord. Now if you continually refuse that work of the Holy Spirit in your heart revealing Jesus Christ to you, reproving you of your sin because you do not believe in Him, if you continue in that mode there is no forgiveness because God has provided no other way for men to be saved. As Peter said," neither is there Salvation in any other, for there is no other name given among men, whereby we must be saved." So for you to reject God's provision for your sins through the death of His Son leaves God no alternative: there is no forgiveness for you, not in this world or in the world to come. Because God has made only one provision for men's sin the Holy Spirit bears witness to your heart of that truth. To refuse to believe, to refuse to except the witness of the Spirit, is ultimately to blaspheme against the Spirit. Now as you are progressing in this position against Jesus Christ, ultimately as you are faced with indisputable evidence that Jesus is indeed all that He said He is, by the power of His name and of His life. And your faced with evidence that you can not deny. Because you have continued this rejection mode so long you've got to somehow now rationalize or explain this obvious evidence for the fact that He is indeed the Son of David, the Messiah. And the Pharisees having adopted this mode of rejection of Jesus, were coming close to the place of no return when they said," He is doing those works by the power of the devil." Now they're beginning to deny obvious evidence and when a person comes to that place in his rejection of Jesus Christ, where he begins to deny this obvious evidence that God puts in his path, and begins to try to explain away the evidence that God is placing before him, that person is coming close to that place testified of in John 12:38 where the Pharisees finally came. Therefore they could not believe. He comes to that place where it's impossible for him to change, to believe, to turn around the mode he has established, and he's gone to far down the road, and there is no turning back. And the denial of obvious evidence which is shown when they begin to attribute the works of Jesus Christ, to Satan. Because how are you going to explain the fact that this demon possessed man is now talking, he is now seeing, whereas before he was dumb, and he was blind. Evidence that they can not deny. He is standing there before them talking. And so they have to give some explanation. Denying the evidence before them, you're getting close.