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“We have only one story. All novels, all poetry, are built on the neverending contest in ourselves of good and evil. And it occurs to me that evil must constantly respawn, while good, while virtue, is immortal. Vice has always a new fresh young face, while virtue is venerable as nothing else in the world is.”
― John Steinbeck, East of Eden

“People who claim that they're evil are usually no worse than the rest of us... It's people who claim that they're good, or any way better than the rest of us, that you have to be wary of.”
― Gregory Maguire, Wicked: The Life and Times of the Wicked Witch of the West

“The books that the world calls immoral are books that show the world its own shame.”
― Oscar Wilde, The Picture of Dorian Gray

“Animals don't behave like men,' he said. 'If they have to fight, they fight; and if they have to kill they kill. But they don't sit down and set their wits to work to devise ways of spoiling other creatures' lives and hurting them. They have dignity and animality.”
― Richard Adams, Watership Down