“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.”

“Free will doesn’t exist. Only the illusion of free will, because the causes of our behavior are so complex that we can’t trace them back. If you’ve got one line of dominoes knocking each other down one by one, then you can always say, Look, this domino fell because that one pushed it. But when you have an infinite number of directions, you can never find where the casual chain begins. So you think, That domino fell because it wanted to.”

“I am your enemy, the first one you've ever had who was smarter than you. There is no teacher but the enemy. No one but the enemy will tell you what the enemy is going to do. No one but the enemy will ever teach you how to destroy and conquer. Only the enemy shows you where you are weak. Only the enemy tells you where he is strong. And the only rules of the game are what you can do to him and what you can stop him from doing to you. I am your enemy from now on. From now on I am your teacher. I will devise the strategy of your army, and you will learn to be quick and discover what tricks the enemy has for you. Remember, boy. From now on the enemy is more clever than you. From now on the enemy is stronger than you. From now on you are always about to lose.”

“Perhaps it's called the end of the world because it's the end of the games, because I can go to one of the villages and become one of the little boys working and playing there, with nothing to kill and nothing to kill me, just living there. As he thought of it, though, he could not imagine what "just living" might actually be. He had never done it in his life. But he wanted to do it anyway.”

“An enemy, Ender Wiggin," whispered the old man. "I am your enemy, the first one you've ever had who was smarter than you. There is no teacher but the enemy. No one but the enemy will tell you what the enemy is going to do. No one but the enemy will ever teach you how to destroy and conquer. Only the enemy shows you where you are weak. Only the enemy tells you where he is strong. And the rules of the game are what you can do to him and what you can stop him from doing to you. I am your enemy from now on. From now on I am your teacher.”

“Miro, I'm so sorry. I always felt such pity for you humans because you could only think of one thing at a time and your memories were so imperfect and . . . now I realize that just getting through the day without killing somebody can be an achievement."It gets to be a habit. Most of us manage to keep our body count quite low. It's the neighborly way to live.”