“You are all a lost generation.” Serving as an epigraph to his novel “The Sun Also Rises,” Ernest Hemingway took this famous phrase from friend and writer Gertrude Stein while living in Paris after World War I. It was meant to convey the disillusioned attitudes and beliefs of the post-war generation, the loss of faith in progress and human dignity. In a more literal sense, the Lost Generation reflected the heavy toll of the war, which cost tens of millions of lives.