“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 were all fated to die, and so it is good that at least we can be sure our deaths today might bring about a good end, might make the world a better place.”

“Good people aren't good because they never cause harm to others. They're good because they treat others the best way they know how, with the understanding that they have.”

“[Ruthie] ... if he was a good man, how could he leave me? So he must not be a good man. But if he isn't good, then why does it hurt so much to lose him?”

“My husband is a good man," she said. "It's important to him to be a good man. He has to not only be good, he has to believe that he's good. In the eyes of God, in my eyes, in his parents' eyes, in his own eyes. Good.”

“Every time, I've won because I could understand the way my enemy though. From what they did. I could tell what they though I was doing, how they wanted the battle to take shape. And I played off of that. I'm very good at that. Understanding how other people think. - Ender Wiggin”

“Human beings are free except when humanity needs them. Maybe humanity needs you. To do something. Maybe humanity needs me—to find out what you're good for. We might both do despicable things, Ender, but if humankind survives, then we were good tools.”