In the novel A Thousand Splendid Suns Nana tries to isolate her daughter Mariam from the real world by telling her what she have been through. From the quote "A man's heart is a wretched, wretched thing, Mariam, it's isn't like a mother's womb. It wont bleed, it wont stretch to make room for you." Identify what Nana is trying to tell Mariam. And what is her purpose for telling her this?