Redmeption

Sin and redemption is such an important theme in this book. I think the fight and beating that Amir took was a cathartic experience for Amir. He had carried the guilt of not helping his friend Hassan for most of his life. The beating he takes from Assef is a release from so much of that guilt. This beating should have happened in Amir's childhood. At least now he can take it for Hassan's son. You can find the theme of redemption explained in detail at the GradeSaver link below:

http://www.gradesaver.com/the-kite-runner/study-guide/themes