In Chesterton's The Secret of Father Brown, a beloved nobleman who murdered his good-for-nothing brother in a duel thirty years ago returns to his hometown wracked by guilt. All the townspeople want to forgive him immediately, and they mock the titular priest for only being willing to give a measured forgiveness conditional on penance and self-reflection. They lecture the priest on the virtues of charity and compassion.
Later, it comes out that the beloved nobleman did not in fact kill his good-for-nothing brother. The good-for-nothing brother killed the beloved nobleman (and stole his identity). Now the townspeople want to see him lynched or burned alive, and it is only the priest who – consistently – offers a measured forgiveness conditional on penance and self-reflection.
The priest tells them:
"It seems to me that you only pardon the sins that you don't really think sinful. You only forgive criminals when they commit what you don't regard as crimes, but rather as conventions. You forgive a conventional duel just as you forgive a conventional divorce. You forgive because there isn't anything to be forgiven."