I teach high school English. Sentences aren’t “defined.” Sentences, within the context of an entire work, are interpreted. Interpretations take into account many aspects; i.e., author background, historical circumstances, psychology, etc. Perhaps that’s where you’re having problems. You should have gone to Catholic school, because the nuns would have taught those literary concepts better than your teachers apparently taught them. The phrase you posted is not a prayer. Yes, it does state Mary twice (you can count!), but stating somebody’s name does not a prayer make. In fact, I’ve said two prayers for you today and didn’t mention Mary once!
You are making good progress! If I may so.
I've noticed for all the wordiness in this reply, you've finally managed to say what the sentence ISN'T; but not what it is.