45 - God appoints Cyrus to subdue the nations. Only God will save.
46 - The idols can't do a thing, but God will accomplish all His purpose.
47 - Babylon, given to pleasure and trusting in wicked enchantments, will be exiled in shame, though she assumes it could never be.
48 - God will reveal a new thing, so Israel can't credit their idols: He will redeem Israel from Babylon