"We must," said Peter. "Cheer up, Susan. It's no good behaving like kids now that we are back in Narnia. You're a Queen here. And anyway no one could go to sleep with a mystery like this on their minds." (2.56)
"Are you going to tell me what you wouldn't tell me the other day?" said Caspian.
"I am," said the Doctor. "But remember. You and I must never talk about these things except here—on the very top of the Great Tower." (4.50-51)
[Caspian] also began to see that Narnia was an unhappy country. The taxes were high and the laws were stern and Miraz was a cruel man. (5.2)