Some have associated the phrase “blasphemy against the Spirit” (Matt. 12:31; Mark 12:31) with sin that can’t be forgiven. The context of this passage shows Jesus condemning the Jewish leaders who were accusing Him of doing miracles through the power of the Devil. By claiming this, they blasphemed the Holy Spirit. Today the only “unforgiveable” sin is not accepting the true Jesus as described in the pages of the Bible (John 3:18; 2 Cor. 11:4), which is necessary to become a “new creation in Christ” (2 Cor. 5:17).
Indeed, God will never undo the forgiveness of sins given freely to those who have accepted God into their lives. Jesus promised that “no one shall snatch them out of my hand” (John 10:28). If you are a Christian who is worried about losing God’s forgiveness, the very fact that you are concerned is a sign that you haven’t lost this relationship. On the other hand, if you have never accepted Jesus into your life, would you consider doing so today?