Can Believers Commit Blasphemy Against The Holy Spirit?

This is highly debatable and largely depends upon whether one adheres to the doctrine of eternal security, (the perseverance of the saints) or the security of the believer's position in Christ; i.e., what position one assumes determines his outlook.  If you believe you have free will as a believer even to "change your mind" and reject Christ after having been born again and receiving Him, you obviously will believe one thing, and if not, the other side of the coin.  Only those with a sham, a facade, and spurious faith fall away--their departure manifests their true state (cf. 1 John 2:19).  Our salvation is in God's hands (cf. John 10:28), not ours, as was our election, which was an act of divine sovereignty as it was God's election of us, not our election of God.  Our destiny, in toto, is in God's hands (cf. Job 23:14)!  In summation, He saved us (cf. Matt. 1:21; Tit. 3:5); He did.  He keeps us (Jude v. 1);  He does!  He is coming for us (cf. Rev. 22:20; 1 Thess. 4:14-17); He will!

Our destiny is solely in God's hands because salvation is of the Lord (cf. Jonah 2:9; Psa. 3:8, 37:39; Heb. 10:38). There are only three possible scenarios:  We contribute naught! It is not of man alone (cf. John 6:28-29)!  NB:  If we had to do anything, we'd foul it up and fall short!  Neither is salvation of man cooperating with God or of God and man.  But only on the merits of the Lord or of the Lord!  That's the only way there can be security and assurance.  Therefore, it doesn't depend upon human performance, behavior, or conduct.  Salvation is not by our work (cf. John 6:28-29).  We are not saved by good behavior but unto good behavior!  We realize this to be grace-oriented; therefore, we are not under probation as Christians! Scripture vouches for the permanency of salvation (cf. Heb. 5:9; 9:12; John 6:37), and the continuity in the state of grace regardless of fellowship (cf. Rom. 5:20; 6:1).  We can be pruned and disciplined, but not separated from the state of grace in God (cf. John 10:37-38; Heb. 12:5-6; Psa. 94:12).

Now concerning the issue in question: Blasphemy against the Holy Spirit.   Some scholars interpret this as the final and complete rejection of Christ; some as attributing the work of God to that of Satan; and some as insulting the Spirit of grace by disparaging and degrading Christ publicly.   One thing we do know is that this sin is done verbally, whether orally or written, and on purpose with the intent to do it knowingly.  The magazine Christianity Today, in surveys, determined that even believers have rejected Christ an average of 7.6 times before accepting Him!  The "Hound of Heaven" keeps pursuing and wooing us!  The reason is that saying it's the rejection of Christ is that it adds nothing to the formula, equation, or doctrine--we already know those who reject Christ are not saved!   One thing for certain:  if someone is worried they have committed this sin, they haven't!  It is a sign of an unrepentant heart!  But God can take any stubborn heart of stone and make it of flesh--and He makes the unwilling willing, causing us to do His will willingly (cf. Phil. 2:13)!

You can search any faith on earth and they all say nice things concerning Jesus and don't blaspheme Him.  Even heretics are reluctant to ascribe sin.  But even thinking Christ was a moral leader, religious martyr, a wise teacher, or what-have-you, is not enough to get a person saved.  Infidels will acknowledge this too, even more, but even calling Him Jesus the Great doesn't do Him justice and is an understatement!  One must accept Him for who He is (i.e., Lord and Savior)--anything less is inadequate and insufficient.  Even secular historians will acknowledge that He changed the course of history and atheists realize His morality and good example.  He didn't come to live a moral life, but to die for our sins and fulfill the law so we could be free. He didn't come to make bad men good, but dead men alive--to save them and quicken their spirits!

I propose that blasphemy against the Holy Spirit (cf. Matt. 12:32) is something we cannot commit due to our union with Christ.  If we could, then we could lose our salvation!  But we know this is an impossibility.  Jesus was speaking about the possibility of someone doing this.  The Pharisees proclaimed the works of Jesus in His miracles as the works of the devil as if He were a sorcerer or warlock.  Early Jews maintained that Jesus learned this art in Egypt as a child, and some even still maintain this.  It has nothing to do with the profane, abusive language that seems to take the name of the Lord in vain, and Christians are often shocked at what the infidel gets away with, but God is patient and excuses their ignorance.  They need to repent of all their sin and believe in the gospel, not just clean up their gutter mouth. Romans 8:37-39 says that nothing shall be able to separate us from the love of God--this implies even our own will!  To the believer, no sin is unforgivable--God forgave all our sins (cf. Psa. 103:3).

The lesson we are to learn is not to beware that we commit this sin, but that the Pharisees had gone too far and wouldn't believe no matter what.  They had witnessed first-hand the miracles of Jesus and still wouldn't believe (not couldn't believe; i.e., John 12:37).  The hardness of their hearts was profound and only an example.  Note that what Judas did was forgivable, he just didn't believe Christ could forgive him, though he had remorse.  He had attrition, not contrition, and one must have faith to accompany it, which he didn't have.

We must take the Holy Spirit seriously because He can be offended (cf. Eph. 4:30)!  Believers can quench the Spirit by putting out the fire, and they can grieve the Spirit by continual sin and make Him sad concerning our state in Christ.  Our status or position as justified never changes, but our state of fellowship and sanctification depends upon our walk in Christ, obedience, and confession of sin.  Finally, it's comforting to know that whatever we've done, He will gladly receive us (cf. Lev. 26:44; Psa. 130:3-4; 1 John 1:9ff). Soli Deo Gloria!