“because if you can’t kill then you are always subject to those who can, and nothing and no one will ever save you.”

“There was no doubt now in Ender's mind. There was no help for him. Whatever he faced, now and forever, no on ewould save him from it. Peter might be scum, but Peter had been right, always right; the power to cause pain is the only power that matters, the power to kill and destroy, because if you can't kill then you are always subject to those who can, and nothing and no one will ever save you.”

“Hip - Someone who knows the score. Someone who understands "jive talk." Someone who is "with it." The expression is not subject to definition because, if you don't "dig" what it means, no one can ever tell you.”

“When you really believe that using sword can kill people,that's when you will be subject to the law of the sword,"those who use the sword will die by the sword.”

“Always be nice to those younger than you, because they are the ones who will be writing about you.”

“... no one can ever save someone else, you know? We can only save ourselves. You know that, don't you?”