The Brothers Karamazov
by Fyodor Dostoevsky
Herzenstube is a mild-mannered, well-loved doctor who has been a fixture in the town for many years. At the trial he tells the story of how he took pity on Dmitri when he was a young, starving child, offering him some nuts. When Dmitri returned to the town as an adult, he thanked the doctor for this act of kindness.