she added, "I can only sigh, try seventeen years, Charles". She ended her message by saying "Deathly Hallows is my favourite, and that is the most wonderful way to finish the series". When asked before publication about the forthcoming book, Rowling stated that she could not change the ending even if she wanted. "These books have been plotted for such a long time, and for six books now, that they're all leading a certain direction. So, I really can't". She also commented that the final volume related closely to the previous book in the series, Harry Potter and the Half-Blood Prince, "almost as though they are two-halves of the same novel". She has said that the last chapter of the book was written "in something like 1990", as part of her earliest work on the series. Rowling also revealed she originally wrote the last words to be something like: 'Only those who he loved could see his lightning scar. Rowling changed this because she did not want people to think Voldemort would rise again and to say that Harry's mission was over. Major themes Death In a 2006 interview, J. K. Rowling said that the main theme of the series is Harry dealing with death, which was influenced by her mother's death in 1990, from multiple sclerosis. Lev Grossman of Time stated that the main theme of the series was the overwhelming importance of continuing to love in the face of death. Living in a corrupted society Academics and journalists have developed many other interpretations of themes in the books, some more complex than others, and some including political subtexts. Themes such as normality, oppression, survival, and overcoming imposing odds have all been considered as prevalent throughout the series. Similarly, the theme of making one's way through adolescence and "going over one's most harrowing ordeals—and thus coming to terms with them" has also been considered. Rowling has stated that the books comprise "a prolonged argument for tolerance, a prolonged plea for an end to bigotry" and that also pass on a message to "question authority and ... not assume that the establishment or the press tells you all of the truth". Some political commentators have seen J. K. Rowling's portrayal of the bureaucratised Ministry of Magic and the oppressive measures taken by the Ministry in the later books (like making attendance at Hogwarts School compulsory and the "registration of Mudbloods"