Sean

“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 show you where you are weak. Only the enemy shows 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. – Mazer Rackham”
― Orson Scott Card, Ender’s Game