The people have failed to love the Lord as they are called to love the Lord. They are a people who have not been faithful and they are contrasted to the Lord who is faithful. How faithful is the Lord? How does the Lord show His faithfulness?
The Lord promised to make a barren couple fruitful. They had no children, but the Lord promised them to have a biological child even after they were beyond child bearing years. Why does the Lord endanger the child when he finally arrives in history? Why would the Lord do such a thing?