Jesus said, “All manner of sin and blasphemy shall be forgiven… but the blasphemy against the Holy Ghost shall not be forgiven” (Matthew 12:31). What does this mean? Is there really a sin beyond God’s mercy? This post explores Mark 3:28–30 and Matthew 12:31–32, unpacking the context, meaning, and application of Jesus’ solemn warning about the unforgivable sin. Discover the vastness of God’s grace, the seriousness of resisting the Spirit, and the hope available to all who repent.