" And once a thing enters a person’s mind, it’s always there, like woodworm in the leg of a chair, like cells of cancer, like rats in the cavities of the earth; it can’t ever be fully eradicated. Even things long forgotten remain in the dark infinity of the mind; there’s no unlearning. What’s said can’t be unsaid. And no law in this universe is immutable. "

― Donal Ryan , From a Low and Quiet Sea