Chapter 1

From the text:

But he was not sleepy any longer, and when he was not sleepy lying still became almost unbearable, for then it was difficult not to think - and David knew that he must not tliink. He had learned that - then. The only thing to do was to take no notice: you could look and listen, but you must not let what you heard or saw penetrate your thoughts. You must not let your thoughts dwell upon anything more important than whether it would rain or turn out fine, whether you had long to wait for your next meal, or how long it would be till the guard was changed. (pg. 15)