The ending of the novel is sort of bittersweet in that Sohrab's recovery from the traumas he endured in Afghanistan takes so long that the reader is left to wonder if things will ever be O.K. for him or for Amir in that regard. I love the line at the very end of the novel that gives that slight glimmer that things will, in fact, be O.K. After a glorious moment of kite flying, Amir reveals that the Sohrab gives him a lopsided smile and and says "it was only a smile, nothing more. It didn't make everything all right. It didn't make anything all right. Only a smile. A tiny thing. A leaf in the woods, shaking in the wake of a startled bird's flight." The varied imagery of the metaphor is striking and satisifying.
"I became what I am today at the age of twelve, on a frigid overcast day in the winter of 1975. I remember the precise moment, crouching behind a crumbling mud wall, peeking into the alley near the frozen creek. That was a long time ago, but it’s wrong what they say about the past, I’ve learned, about how you can bury it. Because the past claws its way out. Looking back now, I realize I have been peeking into that deserted alley for the last twenty-six years. " (Chapter 1)
This is one of favorite all-time quotes from any book! It captures the essence of the novel, I think, because he remembers that moment that changed the course of his life and he has never been able to let it go.
I have to agree with the first post's example--"There is a way to be good again"--but I also like Hassan's phrase in which he honors Amir: "For you, a thousand times over," which is repeated by Amir to Sohrab on the final page of the novel.
Given the state of bullying and fear today, I believe that the following quote speaks to the importance of standing up for one's self. I think that if more people stood up for themselves, and others, that the world would be a better place. (Hopeful thinking, I know.)
“A boy who won’t stand up for himself becomes a man who can’t stand up to anything.” (Chapter 3)
“There is a way to be good again.” (Pg. 2)
This is said by Rahim Khan to Amir to encourage him to finally redeem himself.
More info here.
I also think that it would be the first post as it is certainly one of the most important theme in the story - seeking redemption. Amir's whole life since winter 1975 had been tied down by guilt and regrets. The second half of the story is all about Amir's repentance as he tries to avoid the same mistake he commited when Hassan was in trouble.