One of the central ideas at play in
The Sorrow of War is that the past can be a refuge of sorts. Even though Kien no longer believes in the bright future that the war was supposed to bring to Vietnam, he
is able to find some sense of hope by returning to his old memories—memories, that is, of his prewar life. In doing so, he is better able to process everything that happened to him during the Vietnam War, as if the mere fact that he was once happy is enough to give him strength in the present.