If you think you know everything,
there's nothing else to learn, until you learn...you don't know everything.

It seems the great advantage of people who annoy us is motivation to engage in reflection.

We all learn a lot from successful people, people who care and make us feel good, yet we learn much more from failures and those who hate us, (we learn how to avoid the mistakes they made.)

Personal growth centers on two types of people, the ones we like and the ones that drive us crazy.

The people who drive us nuts often change us most.

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.