The author included the details to show both brothers lead humble lives as preachers.
The author most likely included these details in the text to show that both brothers are forced to live humble lives as preachers. In the excerpt, the brothers discuss their struggles with scarcity, indicating a humble existence as preachers reliant on the provision of others. This reflects a common theme in literature where characters face challenges that highlight their humility and perseverance in the face of adversity.
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