Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. – Matthew 12:31
What exactly is blasphemy of the Holy Spirit? There are a three basic views. The first view is that it is something that could only be done while Christ was on the earth. From this view, this sin involved seeing the miracles Christ was working through the Holy Spirit and calling them evil, but since Christ is no longer on the earth, this sin can no longer be committed. Many great men and women of the faith have held this position so it is clearly within the pale of orthodoxy. The problem, as I see it, stems from the fact that the blasphemy of the Holy Spirit is not against Christ, it is against the Holy Spirit. One of the greatest works of the Spirit is to reveal that Jesus is the Son of God. He has not ceased in doing this work and his work can still be blasphemed.
The second view is also held by many, and it considers blasphemy of Holy Spirit rejecting the Holy Spirit’s work until death. In other words, to never come to faith in Christ. This seems reasonable because that is unforgivable. I believe rejecting Jesus until death is an outworking of blasphemy of Holy Spirit as I will explain below, but this view seems to leave out the fact that blasphemy is a sin of communication. That is the thrust of the sin, and to ignore that seems to miss the mark.
A Third view holds that blasphemy of the Holy Spirit is a sin of communication. It is a known, malicious, speaking of the works of the Holy Spirit as evil. It can still happen today, but it cannot be committed ignorantly. What this means is that there must be a mental assent, or a full knowledge, that the Holy Spirit is the one doing the work, but in an attempt to suppress that truth in unrighteousness, the person blasphemes by calling it a work of evil.
One of the reasons many believe this sin cannot be committed unknowingly is because it is often linked with the sin found in Hebrews Chapter 6. In that passage, the person has been enlightened to the truth, and has even partaken in the Holy Spirit’s work; though not salvifically. They know and understand the truth and still reject Christ. In rejecting Christ they are rejecting the Holy Spirit who testifies of Him. The person who does such a thing is said to have crucified Christ afresh, and that it is impossible to renew such a one to repentance (Heb. 6:6). Since the scripture tells us that all sin is forgiven of men except blasphemy of the Holy Spirit, and the sin committed in Hebrews 6 also seems to be unforgivable, there seems to be a good reason to link the two.
So how do Bible expositors link blasphemy of the Holy Spirit to being a continuous ultimate denial of the grace of God? They do this by looking at Jesus’ words which shows us that this blasphemy is ultimately a sin that flows from the heart. Jesus says, “For out of the abundance of the heart the mouth speaks.” This sin flows from a heart that is so hard toward the things of God that it will never repent, and God in his purposes has turned them over to this hardness and leaves them there.
The sin of blasphemy of the Holy Spirit has caused many people trouble and fear. They wonder after reading about it if they have committed it. If this is you, and your concern stems from a heart that desires to be right with the Lord, then you have not committed it. If a person’s heart is sensitive to the truths of God, then they are not guilty of blaspheming the Holy Spirit. The person who’s heart is as hard as those who blaspheme the Spirit would not be concerned about being right with the Lord. They would despise Him.
Another aspect of this sin is that those who have been saved cannot commit it. In Hebrews 6 the author says to his audience of believers that he did not expect them to fall away and crucify Christ afresh. Instead he expected to see from them things that “accompany salvation.” From the context, perseverance seems is one of those things that will accompany salvation. So a Christian is unable to commit this sin for we are kept by the power of God through faith.