The only way to learn is by changing your mind.

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.

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.

When you have faith in something a lot of other people believe then you a member of the church" said Ceas, "When you have faith in something nobody believes, then you a complete wacko

You're cultural supremacists to the core. You'll perform your Questionable Activities to help out the poor little piggies, but there isn't a chance in the world you'll notice when they have something to teach you.

Writer’s block is my unconscious mind telling me that something I’ve just written is either unbelievable or unimportant to me, and I solve it by going back and reinventing some part of what I’ve already written so that when I write it again, it is believable and interesting to me. Then I can go on. Writer’s block is never solved by forcing oneself to “write through it,” because you haven’t solved the problem that caused your unconscious mind to rebel against the story, so it still won’t work – for you or for the reader.

So from then on, he looked at all his choices and said, What would a good person do, and then did it. But he has now learned something very important about human nature. If you spend your whole life pretending to be good, then you are indistinguishable from a good person. Relentless hypocrisy eventually becomes the truth.