Analysis of descriptive sequence of events

When i was reading "Structural analysis of Narratives" written by Ronald Barthes, i highlighted many words that i wanted to know the meaning of. I mean the level of the writer is very high. Why did the writer in detail discussed about the language of narrative ? I thought a lot about the answer and i didn't got my answer until i finished reading" The Adventures of Sherlock Holmes" written by A. Conan Doyle. Then i thought of making a relation between Barthes and Doyle which really helped me getting the answer of my question. In Barthes writer is talking about language of narrative because narrative(a story) can consist of some words which means different in real world of language but if you read the whole sentence you can figure out the meaning of that unique word. For instance, in Doyle's article, when Dr. Grimesby Roylott(the killer) met Holmes(the detective) at his house, Holmes said "Pray take a seat"(Pg 114). I got stuck at that sentence, so i read it again and then i understood that according to the writer,in the above mentioned sentence , "pray" means "please". So, in order to know what excatly the writer meant by that word is to read the whole sentence over again.That is how i understand why barthes wrote in detail about the language of narrative.