Blasphemy of the Spirit is known as the unpardonable or unforgivable sin. It is commonly defined as denying the work and ministry of the Holy Spirit which is to convict of sin:
“And when He comes, He will convict the world concerning sin and righteousness and judgment; concerning sin, because they do not believe in Me; and concerning righteousness, because I go to the Father and you no longer see Me; and concerning judgment, because the ruler of this world has been judged.” John 16:8-17
If a person is not convicted concerning sin, and they do not believe in the finished atoning work that Christ accomplished on the cross, that person cannot be forgiven in time or eternity.
A CONDEMNED GENERATION
The sin of blasphemy of the Spirit has been defined as it relates to each individual and their personal rejection of the ministry of the Holy Spirit. But blasphemy of the Spirit must also be defined in the light of the historic and cultural circumstances as it related to the nation of Israel as a corporate entity. Jesus rebuked the people of Israel of his day corporately calling them “a wicked and adulterous generation” (Mt 12:39). Except for a called out remnant which stood in opposition to the religious leaders of the day; that generation was condemned for blasphemy of the Holy Spirit.
“The men of Nineveh will stand up with this generation at the judgment, and will condemn it because they repented at the preaching of Jonah; and behold, someone greater than Jonah is here. The Queen of the South will rise up with this generation at the judgment and will condemn it, because she came from the ends of the earth to hear the wisdom of Solomon; and behold, someone greater than Solomon is here.” Matthew 12:41-42