Readers can find many important quotes throughout the book. The book is very focused on class and society, and it is quite a different set-up than what readers likely have experience with. The early chapters of the book do a nice job of world-building and setting up readers to better understand the world that Roth has built. This quote I especially like as a world-building quote:
This is where the factionless live. Because they failed to complete initiation into whatever faction they chose, they live in poverty, doing the work no one else wants to do. They are janitors and construction workers and garbage collectors; they make fabric and operate trains and drive buses. In return for their work they get food and clothing, but, as my mother says, not enough of either.
This quote shows readers that it is possible to not be a part of any of the factions, but it also shows that this is not something to actually strive for. The factionless are forced to live a life in which they can barely provide for themselves. However, I think the most important part of this quote is that it slams city workers as a job in general. I would imagine that various readers could be quite offended by this depiction of the factionless.
As the previous quote shows, being a part of a faction is a big deal. The concept is driven into people from an early age. Even the motto of a particular group is meant to show how valuable being in a faction is:
We give one another far more than can be adequately summarized. In our factions, we find meaning, we find purpose, we find life.
I think of the motto I read in my Faction History textbook: Faction before blood. More than family, our factions are where we belong. Can that possibly be right?
This quote does two important things for readers. First, it continues to show just how important the factions are to the story's society. Second, it shows the protagonist questioning the validity of such thinking.