If human beings are all monsters, why should I sacrifice anything for them?" "Because they are beautiful monsters..., And when they live in a network of peace and hope, when they trust the world and their deepest hungers are fulfilled, then within that system, that delicate web, there is joy. That is what we live for, to bind the monsters together, to murder their fear and give birth to their beauty.

Ender nodded. It was a lie, of course, that it wouldn’t hurt a bit. But since adults always said it when it was going to hurt, he could count on that statement as an accurate prediction of the future. Sometimes lies were more dependable than the truth.

Darkness bound them closer than light.

the seed of doubt was there, and it stayed, and every now and then sent out a little root. It changed everything, to have that seed growing. It made Ender listen more carefully to what people meant, instead of what they said. It made him wise.

Quim," she said, "don't ever try to teach me about good and evil. I've been there, and you've seen nothing but a map.

Oh, I'll live Ender's life, too. It's so much more interesting than my own." ~Val

Knowledge is just opinion that you trust enough to act upon.