"Come. There is a way to be good again" This quote is significant because it indicates that Rahim Khan has known Amir's secret all these years, the secret of Amir's cowardice when Hassan was being attacked by bullies while running a kite for Amir
"...the elephant in the room'...Nothing could more correctly describe the initial moments of my reunion with Rahim Khan". Amir's reunion with Rahim Khan is uncomfortable because of what is left unsaid. Rahim Khan knows Amir's secret shame, but does not mention it.
"He's sit in the back of the room, dressed in his shiny old gray suit, wooden cane across his lap, smiling. Sometimes he even took notes."
"I told him I had written stories in the leather bound notebook he had given me, but he didn't remember the notebook."
"And now it was just another pile of rubble"
"Rahim Khan had always been one of the most instinctive people I'd ever met". When Amir had been a child, Rahim Khan had been the only one who had picked up on Amir's hurt at his father's treatment of him. Rahim Khan also knows that something terrible had happened between Amir and Hassan, and that the memory of the incident haunts Amir to this day
"They don't let you be human". In six short words, he describes the severity of the Taliban's oppression of the people
"Agha sahib was like my second father...God give him peace". Hassan's words are ironic, because even though he is not aware of the fact, Baba was indeed his biological father
"Hassan had so many questions about you"
"...it was in the way he smiled. Looking at the photo, one might have concluded that this was a man who thought the world had been good to him". This quote captures the essence of Hassan's character. Even though he had always been treated as an inferior because of his ethnicity, Hassan never complained or expressed unhappiness