In her song again echoing Hannah's, Mary describes what God has already done. Notice how her song emphiasizes differences: God has brought down the powerful and lifted up the lowly. God has fed the hungry and sent the rich away empty.
Who should be reassured by this song? Who should start worrying?
In verses 54-55, Mary reminds us that God has helped Israel according to the promises made to our ancestors.God's promise is to Abraham and his descendents forever. How do these words sound to us Christians when we relaize that both Jews and Muslims consider Abraham to be their ancestor as well.