You might think that the Dauntless are totally fearless, but that's not necessarily a good thing. Fear can be useful. If you think it's a good idea to walk into a lion's cage, your fear might tell you to get a sandwich instead. As Four notes, the Dauntless jump on trains, but it's not brave to jump to your death. Which becomes an issue when Al commits suicide.

See how family and "identity" overlap: Tris may miss her family, but she feels that she doesn't belong there. In other words, her identity doesn't match up with her family. But check out how vividly she describes the pleasures of her old home—"evening firelight," the sound of knitting needles. She may not belong in that family (she thinks), but she sure misses it.

We admit, this is kind of a weird quote to start talking about friendship. Here's Tris on the first night, and she's disgusted that Al can't keep it together. But Al is only expressing out loud what everyone ("the rest of us") is feeling. So maybe this quote shows a reason for strong friendships to form here: everyone here is going through the same feelings. They already have something in common.