These three chapters of the letter of Romans are not always easy to understand. Paul is writing with great emotion about the failure of his own people the Jews to accept Jesus as Lord. He writes however with great hope and expectation that as God has accepted non-Jews into his family, so his people Israel, if they trust Christ have not been rejected forever.
The chapters contain promises of God’s faithfulness, reminders of his sovereignty and justice, and also warnings not to take faith for granted. Ultimately Paul finally confesses our Sovereign God can’t be reduced to human understanding. He is simply unfathomable, but his mercy and riches of grace are also deep.