I think that you will find quote all over the book that represents Bruno's point of view. Essentially, you will be looking for quotes that represents a level simplicity and innocence, yet possess a profound insight into the surreal nature of life under Nazi rule. The most evident examples of this would be Bruno's pronunciation of "Auschwitz" and "Die Furher." The fact that these are pronounced as "Out With" and "The Fury" represents Bruno's point of view in that they are distortions of conditions in the world that are already distorted. The realities of both Hitler as a leader and Auschwitz as a place are both distortions, and in Bruno's mispronunciation, there is further distortion. From a child's point of view, both concepts would be distorted. The fact that Bruno is outspoken to a point where he refuses to engage in a debasing of another human being can be seen when he asks Maria in a pointed manner if she is a member of the family, or in admonishing Gretel for not treating Maria as such. I think that in finding quotes like these, you will be able to find both Bruno's point of view and why it is so compelling given the context.