“The only process you've mastered is the process of elimination, and the only reason you've mastered that is because you can do it in the toilet.”

“Personal affection is a luxury you can have only after all your enemies are eliminated. Until then, everyone you love is a hostage, sapping your courage and corrupting your judgment.”

“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.”

“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.”

“If God created our will, then he's responsible for every choice we make... So-- as I recall, the official philosophical answer is that free will doesn't exist. Only the illusion of free will, because the causes of hour 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 dominoes that can be traced back in an infinite number of directions, you can never find where the causal chain begins. So you think, That domino fell because it wanted to... Even if there is no such thing as free will, we have to treat each other as if there were free will in order to live together in society.”

“I have hope for you, if only because you're the only one left to hope for.”

“Saving the human race is a frantic one. Or a tedious one. It all depends on what stage of the process you're taking part in.”