You know, Fruchtenbaum teaches that one can gauge their spiritual maturity based on how well they understand the 8 mysteries of the Bible. If you'd like I can email you a manuscript. The gospel of the kingdom is not the gospel of remission of sin. That is obvious.
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Jerry doesn't understand what's going on there. They were in denial. It happens all the time to people (I'm not singling out Jerry). The disciples got this idea in their head that he was going to just forgive sins (no sacrifice involved). Some say this is due to passages/events such as the first exchange in which he proved his authority to forgive by a healing (Mk 2:10). "See, he can forgive, but there didn't need to be a death."
But Christ was a package deal. He would reckon his death into his statements even though it was 3 years off. The disciples made all kinds of foolish mistakes.
The text about not knowing or understanding is not so much theology as character arc. They were unwilling to accept that the whole thing was going that direction. And apparently they said 'we don't know what you are talking about' so much that there was no point in capturing conversation details! That's how denial is!
This explains the force of Peter's denial. Not just that it happened, but that he persisted in it three times. They all had done so already. They all had stale Judaistic theology in their heads. It's called the fear of death. Ask anyone who is about to die, and you'll find that no matter how they have prepared, there is no preparation; you are shocked, and want 'out.'
Then comes the 40 days. They are taught thoroughly that this was SUPPOSED to happen according to the prophets and that the cancellation of the debt of sin is now to be preached, even to Israel who nailed him to the cross!!! It is absolutely wonderful, grace, mercy and forgiveness.
But to Jerry it is a mess and is totally lost.
They were certainly not taught about a kingdom for Israel, because that thought is snapped at Acts 1:8 and it never surfaces again. Their last mistake like that, it seems.
Peter's message, explaining the noise of the Spirit, is just that. The people who nailed Christ did so in a set plan and foreknowledge that God was bringing a way of remitting sins. So it was not a LOSS!!! It was a victory!!! Of course, they were wrong to do so, but so were the brothers of Joseph to throw him in a pit for trade for money. It still ended in a victory.
But this story and victory is lost to Jerry because he has a separate story that is perfectly dull.
This Jesus then gets put on the much-dreamed throne of David!!! And why not? Every title that can be named!!! There is nothing so amazing, so powerful, so intimately kind to the worst enemy, a story that applies to the whole universe! Peter powers on in the next speech with the assumption that Christ would return shortly and renovate everything about this world! That is how powerful the hope there is in the victory resurrection and enthronement of Christ! Yes it is a complete taste of the powers of the world to come (Heb 6:5) where everything will be right!
But 2P2P turns it into regurgitated muck that no one would care for. Nothing damages the throb and passion of the Gospel like 2P2P. It is not just wrong on every exegesis, it is disgusting.