My Name is Asher Lev, Chapter 13

I'm not sure what you mean by "rebbe." In Chapter 13, Asher gives a lot of thought to his family and considers the nobleman who had massacred a number of Jews. Asher's contemplation had to do with ultimate responsibility for this act, and in the end he wondered if his grandfather, who'd helped the man get rich, also had some of the responsibility of those murders because he'd had a part in making him rich. This caused Asher to wonder if his grandfather had similar reasons to his own for his artisic journey.