(..) I looked at the photo. Your father was a man torn between two halves, Rahim Khan had said in his letter. I had been the entitled half, the society-approved, legitimate half, the unwitting embodiment of Baba’s guilt. I looked at Hassan, showing those two missing front teeth, sunlight slanting on his face. Baba’s other half. The unentitled, unprivileged half. The half who had inherited what had been pure and noble in Baba. The half that, maybe, in the most secret recesses of his heart, Baba had thought of as his true son.
I slipped the picture back where I had found it. Then I realized something: That last thought had brought no sting with it. Closing Sohrab’s door, I wondered if that was how forgiveness budded, not with the fanfare of epiphany, but with pain gathering its things, packing up, and slipping away unannounced in the middle of the night.

(Khaled Hosseini "The Kite Runner")