I’ll say it emphatically: There is no sin that can’t be forgiven.
I recognize that statement flies directly in the face of passages like Matthew 12:31-32 and Hebrews 6:4-6 that talk about “unforgivable sins,” but those are understood to be outright rebellion and hostility towards God. Speaking evil of the Holy Spirit is to reject His Word.
And where else do we see this same type of spirit? In Deuteronomy 17:12.
The Text even uses the same word (presumptuousness) to describe what’s going on. When a man has a dispute that can’t be solved by the lower courts, they are allowed to take it to the highest court in the land to receive a decision.
This process is different than a standard court of appeals, where someone can ask a higher authority to judge a matter if they don’t like the outcome of the first one. Instead, these are reserved for matters where the facts are fuzzy-ish enough that a secure verdict can’t be reached.
Once the matter is taken to this high court and a decision is reached, then it’s required that the parties abide by the decision. If they do not, they are executed.
That shows how serious God takes these types of decisions. For someone to become overly confident to the point that they’re willing to defy the highest court of the land (a.k.a. “presumptuousness”), then there’s really nothing else they would be willing to submit to. In their mind, it’s their will and nothing else.
That type of person can’t exist in a society that has laws. Social order (and religious order) is established because someone recognizes a higher authority than themselves; remove that, and you have chaos.
Act presumptuously towards God, and you have condemnation. That’s why this sin is called “unforgivable” — not because someone can’t turn around and submit to God, but because they won’t. An arrogant heart towards God will never result in bending the knee to His will.
If that’s the case, there’s nothing else that can be done.