The best response based on the text provided is:
The theme emerges as a broad lesson about conflicting personalities and is later refined into a specific lesson about avoiding impulsive action when angry.
This is because the initial interactions between Cora and Ruky suggest a dynamic of conflicting personalities, particularly with Cora's care for her brother and her moments of anger or ill-temper, which can be reflected upon as impulsive actions. As the story progresses, the lessons related to their relationship and actions could lead to a deeper understanding of managing emotions and interactions.