What does it mean to blaspheme the Holy Spirit? Blasphemy in The Bible can typically mean three things: 1-Claiming to be God (John 10:30-33) 2- Claiming to be able to remove sin - which is why many people dislike the Vatican and the Pope - (Mark 2:4-7) 3- Claiming there is no God 2. Why is it an unforgivable sin? Aren't all sins forgiven? Many people have come out and have given different reasons as to why blasphemy against The Holy Spirit is unforgivable. "Blasphemy against the Holy Spirit" is conscious and hardened opposition to the truth, "because the Spirit is truth" (1 John 5:6). Conscious and hardened resistance to the truth leads man away from humility and repentance, and without repentance, there can be no forgiveness. That is why the sin of blasphemy against the Spirit cannot be forgiven, since one who does not acknowledge his sin does not seek to have it forgiven. — Serafim Alexivich Slobodskoy, The Eighth Article of the Creed This is one of the most popular interpretations that many believe. I suggest you do some more research on the topic. 3. Could Hitler went to Heaven if he believed in the Gospel and repented? Generally speaking, yes. The Bible teaches that anyone can be forgiven of their sin if they repent and give their life to Jesus Christ. However, it is important to know that The Bible also teaches that the LORD God is of infinite wisdom, and so us humans would realistically never know who goes to Heaven or Hell, even though we can make educated guesses based on the scriptures.