"The last time I trusted a faction representative with this information, all my friends were murdered." (3.19)
In the world of Divergent, loyalty to a faction can mean the difference between life and death. Almost all of the book's major decisions depend on a person deciding whether to be loyal to their leader or to go instead with what they themselves believe in.
"In order to have peace, we must first have trust." (3.21)
This line by Johanna is true, but nobody will listen to it. By the end of the novel, the whole faction system is in jeopardy. There's no peace, and no one trusts anyone.
"Dauntless is split in half," Edward says, talking around the food in his mouth. "Half at Erudite headquarters, half at Candor headquarters." (8.37)
Ignoring Edward's poor dinner etiquette, it's apparent early on that the line is being drawn. Who are the Dauntless loyal to? To Erudite or Candor? Why aren't they just loyal to themselves?
The idea is so ridiculous to me that I half snort, half laugh. It can't be true. Except. Except: He never talked about his family or his childhood. (10.36-10.38)
At this point, Tris starts wondering just what her dad's loyalties were. Evelyn has told him that he used to eat lunch with Jeanine. Dining with the enemy?! What does that mean? Did he betray Abnegation?
"No matter how long you train someone to be brave, you never know if they are or not until something real happens." (14.66)
Cowardice is often cast as the opposite of bravery. In Insurgent, betrayal results from cowardice. People who aren't loyal to their factions are seen as cowardly traitors.
There are more Dauntless in the room, Dauntless without blue armbands—loyal Dauntless. My faction. (16.28)
If a faction is divided in two, is it really a faction anymore? Tris identifies herself as one of the loyal Dauntless, but aren't the "traitorous" Dauntless just loyal to someone else? Who makes the rules?
I feel a flare of anger—how many things is [Tobias] going to keep from me? – and try to stifle it. Of course he couldn't tell me Uriah was Divergent. He was just respecting Uriah's privacy. It makes sense. (17.107)
Tris realizes something important here: just because Tobias is loyal to someone else (in this case by respecting Uriah's privacy and his faction rules), that doesn't mean that he is betraying Tris. She is not the only person in his life he has to be loyal to.
"It sort of defeats the purpose of being a spy if you tell everyone that's what you are." (19.34)
So, Zeke proves his loyalty by defecting to the other side and spying on them, which means that he's pretending to be loyal to someone else, but isn't. Is loyalty all about choosing sides?
"Don't you think someone with the aptitude for multiple factions might have a loyalty problem?" (19.104)
Is being Divergent pretty much exactly the same as being disloyal? Sure, Disloyal wouldn't be as catchy of a title for a book, but we do have to wonder what makes the Divergent different from all these people getting slapped with the label "traitor."
[The factionless] are not characterized by a particular virtue. They claim all colors, all activities, all virtues, and all flaws as their own. (37.66)
Tris is amazed that the factionless stick together. When you think about it, the faction system is a lot like a fraternity. Tris, being raised inside that system, doesn't realize that some people are loyal and loving to one another just because they're people… not because they're from the same secret society.