“How do I know I can trust you?''You can't,' he said bluntly. 'You've got to take it on faith that the enemy of your enemy is your friend.”

“You've got to take it on faith that the enemy of your enemy is your friend.”

“There's ways you can trust an enemy you can't always trust a friend. An enemy's never going to betray your trust.”

“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.”

“If your not my friend, then your my enemy and if your not my enemy then i don't know you.”

“If those are your friends, you've got no need for enemies.”