Please explain blasphemy against the Holy Spirit.

Jesus could perform miracles by the power of the Holy Spirit (Matt. 12:28).  After witnessing him perform a miracle by the power of the Spirit, the hard-hearted Pharisees attributed what the Spirit did to Satan, thus blaspheming the Spirit (Matt. 12:24).  The sin was unforgivable because their hearts were so hard that even witnessing a miracle done by the power of the Spirit couldn’t sway them (Mark 3:28-29).

Miracles done by the power of the Holy Spirit no longer take place, but we can still blaspheme the Holy Spirit today.  You see, we have the Word of God through the miraculous power of the Holy Spirit in that the Spirit inspired the authors of Scripture (2 Pet. 1:19-21).  When we willfully, stubbornly, and unrepentantly reject the Spirit-inspired Word of God, we insult the Spirit of grace and will not be forgiven (Heb. 10:26-31).