Tall Boy learns to value himself not for the characteristics that made him prideful and successful before his injury, but for the positive inner qualities that make Bright Morning marry him.
Before Tall Boy is shot, he's a leader for the warriors in the tribe. The position gives him a lot of power in their community and makes him arrogant. This arrogance comes from his strength and fighting prowess; they're what give him pride. However, he loses all of that as soon as he's paralyzed.
The paralysis happens as he's trying to rescue Bright Morning from slavery. He's successful, though after it's clear that he won't be able to fight anymore and he's relegated to the status of a woman in the tribe, she still decides to marry him. This is because it isn't his warrior strength that she loves—it's his heart and the devotion he has to the people he cares about.
After their marriage, Tall Boy learns to value those qualities in himself. Where at first he had trouble adapting to his new role, he finds new ways to be fulfilled. It tempers his haughty pride and makes him more open to others as well. Of course, it takes some time for this to occur. Tall Boy is very depressed about his injury at first. In the end, though, he still reveres the idea of a man as a warrior—since he makes a lance for his son.