Have you come across this or remember reading it before:
Can it be that there is a sin that is so bad that it is unforgivable? A line that even God says, "even I cannot go there.' Some action that is so reprehensible and evil that you will have a mark of shame on your soul for eternity? And if there is such an act, is "blaspheming the Holy Spirit" such an act?
Jesus makes it clear that disciples are forgiven to the extent that they forgive others. The Lord's Prayer even says it: "And forgive us our trespasses as we forgive those trespass against us." We are restored through the act of forgiveness.
The role of the Holy Spirit is the Spirit of forgiveness. Jesus talks about the Holy Spirit being the "Advocate". The Holy Spirit is advocating for the accused, much like what God does on behalf of Job to Satan (the "Accuser").
Blaspheming is speaking wrongly about God. So when one blasphemes the Holy Spirit, one is saying that Holy Spirit cannot/will not forgive.
When we say there cannot be forgiveness for someone else, when we are not forging the trespasses of others, then we are not restored.
And so, if we are forgiven to the extent that we forgive and we say the Spirit of Forgiveness cannot forgive someone, then we commit an unforgivable action. Not because God does not desire forgiveness, but it becomes a closed circle.
And now for the crude and over simplified "paint" version:
Only forgiveness can break the cycle.