“[after discussion about what evil is, a question asked to Elphaba on why she killed Madame Morrible]"Why did you do it?" asked the hostess with spirit.The Witch shrugged. "For fun? Maybe evil is an art form.”

“It's hard to find evil in this world,' said the Witch. Evil is always more easily imagined than good, somehow.”

“People always did like to talk, didn't they? That's why I call myself a witch now: the Wicked Witch of the West, if you want the full glory of it. As long as people are going to call you a lunatic anyway, why not get the benefit of it? It liberates you from convention.”

“Why should I keep myself so safe?” he asked her, but he was almost asking himself. What is there in my life worth preserving? With a good wife back there in the mountains, serviceable as an old spoon, dry in the heart from having been scared of marriage since she was six? With three children so shy of their father, the Prince of the Arjikis, that they will hardly come near him? With a careworn clan moving here, moving there, going through th same disputes, herding the same herds, as thy have done for five hundred years? And me, with a shallow and undirected mind, no artfulness in word or habit, no especial kindness toward the world? What is there that makes my life worth preserving?“I love you,” said Elphaba.“So that’s that then, and that’s it,” he answered her and himself. “And I love you. So I promise to be careful.”

“The real thing about evil," said the Witch at the doorway, "isn't any of what you said. You figure out one side of it - the human side, say - and the eternal side goes into shadow. Or vice versa. It's like the old saw: What does a dragon in its shell look like? Well no one can ever tell, for as soon as you break the shell to see, the dragon is no longer in its shell. The real disaster of this inquiry is that it is the nature of evil to be secret.”

“She wasn't afraid of doing good or of resisting evil. She was merely afraid she might not be able to tell the difference.”

“Some said the original evil was the vacuum caused by the Fairy Queen Lurline leaving us alone here. When goodness removes itself, the space it occupies corrodes and becomes evil and maybe slpits apart and multiplies. So every evil thing is a sign of the absence of deity”