From Voyage of the Dawn Treader. Lucy has used a spell "which would let you know what your friends thought about you," and what she heard has spoiled a friendship that was just beginning. Aslan arrives:

"Child," he said, "I think you have been eavesdropping."

"Eavesdropping?"

"You listened to what your two schoolfellows were saying about you."

"Oh that? I never thought it was eavesdropping, Aslan. Wasn't it magic?"

"Spying on people by magic is the same as spying on them in any other way. And you have misjudged your friend. She is weak, but she loves you. She was afraid of the older girl and said what she does not mean."

"I don't think I'd ever be able to forget what I heard her say."

"No, you won't."

"Oh dear," said Lucy. "Have I spoiled everything? Do you mean we would have gone on being friends if it hadn't been for this--and been really great friends--all our lives perhaps--and now we never shall."

"Child," said Aslan, "did I not explain to you once before that no one is ever told what would have happened?"