Abstract nouns are nouns that the five senses can not detect. Honesty is like honestly. You cannot see honesty, you can not feel honesty, you cannot see honesty, you can not taste honesty, and you can not hear honesty. So, it is an abstract noun.
Did we mention he’s 13 years old?
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Well actually "The Yellow Wallpaper" was centered around the idea of a woman's position in a marriage and her best practices during that time period. It was about the domestic functions of the wife i.e. produce an heir, clean the home, raise the children, cook dinner etc. The author basically wrote about the lack of psychological development for women kept in this state producing an almost childlike affect on their brains making them seem "ignorant" or "sick" or "insane"