"Human beings are free except when humanity needs them. Maybe humanity needs you. To do something. Maybe humanity
needs me-to find out what you are good for. We might both do despicable things, Ender, but if humankind survies, then we are
good tools."
-Graff is explaining to Ender that people should
help mankind in all ways that they can, Ender has a tough time with this because he views people as more than tools.
"In the moment when I truly understand my enemy, understand him well enough
to defeat him, then in that very moment I also love him. I think it's impossible to really understand somebody, what they
want, what they believe, and not love them the way they love themselves."
-Ender is telling Valentine how he hates himself because once he understands his enemies he kills them, this causes Ender
great emotional stress.
"Welcome to the human race. Nobody
controls his own life, Ender. The best you can do is choose to fill the roles given you by good people, by people who love
you."
-Valentine is explaining to Ender that in life you can
not follow your own path, you follow other people's paths also, and that this is for everyone and not just Ender.