<span>We could not give her those glib assurances that naive souls make so easily to others concerning their after state. …
The narrator is making it clear here that he does not believe in an after life. He says that he cannot assure Mrs. Herd that she was going anywhere in an "after state" because he thinks people who say things like that are being 'glib' and 'naive'. </span>
This fact that this passage is from the perspective of an unreliable narrator is supported by the fact that nobody believes the narrator and at times she barely believes herself.
When she asks Agnes, it is clear that Agnes believes the narrator was dreaming or is lying. The narrator then second guesses herself and tries to justify the vision she saw as some friend of the servants. She decides not to ask anyone else (in case they also think she is making it up), which leads the reader to think that she might not be entirely reliable.
concise and exact use of words in writing or speech.
Where’s the statement to click on? And you already knew it before hand?
In chain} Isabel leaves cash at her mothers grave