The cause of her joy.
Explanation:
The narrator realizes that adhering to those guidelines will result in her happiness. His motivation revolves around making her happy.
Mrs. Rowland's narrative has both positive and negative aspects. She, along with her children, was captured and forcibly separated from them. During her captivity, she sewed clothes for the Native Americans in exchange for food, and they did not inflict harm upon her. Instead, they presented her with a Bible, and after her husband paid the ransom, she was released. After 11 weeks of captivity, her family was reunited.