Jesus on earth, God incarnate, according to Isaiah 53.2 “had no stately form or majesty that we should look at Him, nor appearance that we should be attracted to Him.” Verse 3. “He was despised and forsaken by men, a man of sorrows and acquainted with grief; And like one from whom men hide their face.” Verse 6. “ But the LORD has caused the iniquity of us all to fall on Him.” This was the ministry of Jesus, to take the sins of the world, the very worst we had to offer, including our insults and blasphemies. Excusing our own behavior and accusing Him of not doing enough. This is the expected behavior of the unredeemed, the twisted way of the unsaved, carnal mankind.
Now enter the Holy Spirit who has come to be a comforter for redeemed men, a pledge or seal for the regenerated, and a conviction of sin for the unsaved. So in verse 8 of Mark 3 It says, “ Truly I say to you, all sins shall be forgiven the sons of men, and whatever blasphemies they utter; but whoever blasphemes against the Holy Spirit never has forgiveness, but is in danger of everlasting damnation.” The point being that when the Holy Spirit comes to reveal salvation to the individual, all sin will be forgiven at that point to those who believe and receive the Good News, but the one who rejects it will not be forgiven, for that person has regarded the finished work of Christ and the testimony of the Holy Spirit as useless. That one has rejected and blasphemed the Holy Spirit. He is in danger of eternity without Christ, unless he repents and believes, there is no forgiveness afforded him. These people to whom Jesus was teaching and performing healings were infiltrated by scribes from Jerusalem who were saying that Jesus was possessed by unclean spirits, thus they were blaspheming the Holy Spirit, which is the whole point of His statement here.
The unforgivable sin that so many Christians worry needlessly about, is in essence impossible for a believer to commit. The fact that they believe negates the idea of them not believing, which is the sin that isn’t forgiven. Paul the Apostle declared himself to be the chiefest of sinners, persecuting the believers to arrest, and death, amongst all manner of vile acts, and yet He was called by Christ and redeemed on that road to Damascus, blinded with the glory of the Lord. If he could be saved any of us can be, so great is the power of the redeeming work of Christ. Philippians 1.6 “He who began a good work in you will perfect it until the day of Jesus Christ.”