From Taphophilla:
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I was thinking about the unforgivable sin. The sin is so heinous that it warrants any hope of salvation by the Christian God and null and voids any past, present, and future hope of said salvation. If you commit this horrible act, you are damned for all eternity with no hope of redemption.

It is not murder of the innocents, genocide, child molestation, or even brutal torture. You can commit an act that would make all humans (but not the Christian god) recoil in horror, still receive forgiveness and spend eternity in heaven. You can murder children and babies, brutalize and torture them even and god will forgive you, all you have to is repent. No sin is too severe in nature for god to forgive. Except one.

The one thing humans cannot do, the one sin that causes god to recoil in horror so much so he won't forgive it, the only sin that warrants eternal consequence of which there is no hope, is to deny the Holy Spirit.