The only way to learn is by changing your mind.

At first he thought he felt bad because he was afraid of leading an army, but it wasn't true. He knew he'd make a good commander. He felt himself wanting to cry. He hadn't cried since the first few days of homesickness after he got here. He tried to put a name on the feeling that put a lump in his throat and made him sob silently, however much he tried to hold it down. He bit down on his hand to stop the feeling, to replace it with pain. It didn't help.

A regime that wraps itself in the flag of truth fears truth most of all, for if its story is falsified to the slightest degree, its authority is gone.

Sometimes good people have to do terrible things.

There are times when the world is rearranging itself, and at times like that, the right words can change the world.

In philosophy class I think we finally decided that 'good' is an infinitely recursive term - it can't be defined except in terms of itself. Good is good because it's better than bad, though why it's better to be good than bad depends on how you define good, and on and on.

"We've devoted our lives to learning about them!" Miro said. Ender stopped. "Not from them."