How we cite our quotes: (Chapter.Paragraph) Shmoop has numbered the chapters continuously, but the book renumbers them in each Part.
Quote #4
Fresh upon his months of mastery over his own team-mates, it was beyond his self-control to stand idly by while another devoured the meat that belonged to him. He struck, after his custom, without warning. (14.6)
We get us some courage here, and in some part, it's tied into survival. Meat = his, and he has to fight if he wants to keep it. On the other hand, there's a specific rule involved here. He earned the meat. He really, really earned it. Therefore, he's allowed to be brave as long as it's used in a righteous cause. Sounds kind of civilized to Shmoop.
Quote #5
So run away he did, violating his own nature and pride with every leap he made, and leaping all day long. (15.3)
Here's a question: is White Fang demonstrating courage by running away? Or is he simply following the path he thinks is easiest?
Quote #6
Scott sprang toward him, drawing his fist back to strike. Beauty Smith cowered down in anticipation of the blow. (18.68)
London doesn't mince words here. (Well, he almost never does, but even so.) The good guy is brave and the bad guy's a coward. That makes courage a pretty clear symbol of who we should be rooting for and why.