In Matthew 12 Jesus warns the pharisees about "blasphemy of the Holy Spirit", an unforgivable sin. Ever since, countless followers of Jesus have worried and wondered if they've committed it. Is there really a sin so big, and so bad that it renders us outside of God's power to forgive us? What is it? And how can you know if you've committed it? As with all of Jesus teachings, there is more than what we see on the surface. What if Jesus is showing us something deeper about the nature of forgiveness, and the power of repentance?