Daniel reads the scriptures. Here he is reading Jeremiah. He concludes that the exile will last 70 years.
He is moved to great penitence. He sees the exile as punishment for Israel’s unfaithfulness. He pleads in prayer, beautifully confessing his individual and corporate sin. He asks God to act and reminds god of the offence of the desolation of the temple.
The answer, the prophesy of the seventy times seven, has apparently driven everyone crazy for years. But suffice to say the angel Gabriel says it will be much more complicated and take much longer and involve far worse than has already happened to the Israelites.
It’s a paradigm shift and not a comfortable one, as the whole book has been. On the one hand is comfort that God is in control. On the other hand it’s a warning that God is not tame and that what Israel had will never be again.