There are two interpretations of the story. According to the first version, the main idea is the irony of the narrator in terms of a naive lady. The second interpretation is based on the importance of sincerity in communication between people.
Readers can decide what is the moral of the narration after reading this very short story.
Here is the link to the text of the story:
https://www.vma.is/static/files/enska/Bokmenntir/Short%20Stories/SilastheGood_Bates.pdf