I'm not using evidence from the book, but I can explain how the first person affects the story and reader. You can add the evidence when I give you the prompt answer. - First person point of view affects the story and reader because of the different it makes to the plot and whole setup of the story. First person changes the way the story is set up because it is one of the characters narrating the story. It affects the reader because when you are reading the book, you feel like you are the character in the story. It makes reading the story more enjoyable.
By golden mean Aristote mean choosing the balance between excess and deficit of behavior. In todays time an example of a virtue is courage which is between rash behaviors and cowardice.