Through an analysis of Mark 3:29–30, as well as some commentary on the warning passages in Hebrews, this article discusses what the unforgivable sin is and is not.

What does blasphemy against the Holy Spirit mean? This article defines the meaning of blasphemy against the Spirit and the characteristics of this sin, making it clear that this sin cannot be committed by a child of God. This sin is labeled as an unforgivable sin because of God's justice. However, God protects believers against committing this sin. All other sins can be forgiven by God.