 Other major themes of the series include choice and free will . Meyer says that the books are centered around Bella 's choice to choose her life on her own , and the Cullens ' choices to abstain from killing rather than follow their temptations : " I really think that 's the underlying metaphor of my vampires . It doesn 't matter where you 're stuck in life or what you think you have to do ; you can always choose something else . There 's always a different path . " 
