Alas," said Aslan, shaking his head. "It will. Things always work according to their nature. She has won her heart's desire; she has unwearying strength and endless days like a goddess. But length of days with an evil heart is only length of misery and already she begins to know it. All get what they want; they do not always like it.
C. S. Lewis (2013). “The Chronicles of Narnia Complete 7-Book Collection with Bonus Book: Boxen”, p.98, Harper Collins