In many ways, the Holocaust was a war fought with words. It relied on mass communication technology to convey its message of hate and to mobilize a nation in its service. But, The Book Thief focuses on using language to heal, to save, and to fight against injustice. It expresses a belief in the power of language to make a positive difference in the world. It recognizes the extreme power language contains. The novel shows us the very best and very worst ways language can be used. Sprinkled with German words and phrases, the novel also helps us feel the friendliness and beauty that this language can embody. This is important because after World War II and the Holocaust, German was seen as a language of hate and fear. This book argues that it's not about the language you speak in, or even the words you use, but how you use those words that's important.
Liesel's biggest failure is her failure to communicate her love to Rudy when he is alive.