Pierre’s trip reminds Natasha of Andrei’s year abroad, and she immediately fears betraying Pierre as she did Andrei. Though the fear is natural, Natasha has grown in her understanding of love and isn’t in danger of confusing it with a fleeting passion. Tolstoy ends the main part of the novel with the words “It has to be so,” referring to the mystery of fate and necessity—something Natasha, too, has learned to embrace.