What does the Bible say about blasphemy of the Holy Ghost?

In Luke 12:10, our Lord speaks clearly about the blasphemy of the Holy Ghost, indicating that this particular sin cannot be forgiven. This speaks to the hardened heart that willfully rejects the grace of God. To blaspheme the Holy Spirit is to deny the very means by which we are drawn to Christ, which ultimately illustrates a reliance on one's own works rather than on God's grace. The disciples were cautioned that those who persist in their confidence in fleshly works and reject Christ may find themselves guilty of this unforgivable sin.

This blasphemy is not merely a single act of speech but represents an ongoing posture of the heart that is resistant to the drawing of the Holy Spirit. Believers, however, are reassured that genuine concerns about their standing with God often stem from the Spirit's work within them, which is the grace at play, compelling them to trust fully in Christ. In contrast to the hardened hearts of those who blaspheme the Holy Spirit, those who are troubled by their sin are often the ones secured in God's grace, revealing the profound mercy of His saving work in their lives.