God, speaking through Isaiah, continues to hector the Israelites about how all the bad shit that has happened to them is punishment for not worshipping him sufficiently. He doesn't reward them with money for good deeds, but rather punishes them for the bad then acts all hurt when they go and worship other, more enriching, gods.
For at least the millionth time, he reminds us how he created the earth. Then he moves on to threats against the Babylonians. Again. This book really drags after 35 chapters or so.
Isaiah informs us that he knew he would be a prophet in the womb, and now he's god's attack dog and his purpose is to bring the Israelites back to god. Oddly, he also reaches out to Gentiles here. He promises to restore them to Zion and to defeat all their enemies and so on and so forth. It gets pretty repetitive after 49 chapters. He does manage to finish this one off with a cannibalistic bang: And I will feed them that oppress thee with their own flesh; and they shall be drunken with their own blood, as with sweet wine (v. 26)