Why do we fall?

 So we can learn to pick ourselves up.
 

Blind Prisoner: You do not fear death. You think this makes you strong. It makes you weak.
Bruce Wayne: Why?

Blind Prisoner: How can you move faster than possible, fight longer than possible without the most powerful impulse of the spirit: the fear of death.
Bruce Wayne: I do fear death. I fear dying in here, while my city burns, and there's no one there to save it.

Blind Prisoner: Then make the climb.
Bruce Wayne: How?
Blind Prisoner: As the child did. Without the rope. Then fear will find you again.