Chapter 13-15

Ender's love for Valentine is the trump card; if there is anything on Earth worth saving, in his mind, it is Valentine. She seems to be the only reason that he decides to continue with his training to become commander, and it was also the major reason for his going to Battle School in the first place. "Earth was ... the voice of one girl, who spoke to him out of his far-off childhood. The same voice that had once protected him from terror. The same voice that he would do anything to keep alive, even return to school, even leave Earth behind again for another four or forty or four thousand years."