I'm having some trouble with a special referencing I'm trying to produce, due to its specificity.
So, first, I'm trying to compile two paragraphes (the first one with line numbering on its side), just as below:
\documentclass{article}
\usepackage[modulo]{lineno}
\begin{document}
\begin{linenumbers}
``Hello, here is some text without a meaning. This text should show, how a printed text will look like at this place. If you read this text, you will get no information. Really? Is there no information? Is there a difference between this text and some nonsense like Huardest gefburn? Kjift - Never mind! A blind text like this gives you information about the selected font, how the letters are written and the impression of the look. This text should contain all letters of the alphabet and it should be written in of the original language. There is no need for a special contents, but the length of words should match to the language. Hello, here is some text without a meaning. This text should show, how a printed text will look like at this place. If you read this text, you will get no information. Really? Is there no information? Is there a difference between this text and some nonsense like Huardest gefburn? Kjift - Never mind! A blind text like this gives you information about the selected font, how the letters are written and the impression of the look. This text should contain all letters of the alphabet and it should be written in of the original language. There is no need for a special contents, but the length of words should match to the language.''
\end{linenumbers}
As we see in line 4-5 blind texts like this also gives us informations about the selected font.
Also, line 6 tells us about how these texts allow us to have an impression of its look.
\end{document}
It does work, and produces:
Now, here is my problem. If you notice, just below my random text there is a manual line reference I've introduced ("...line 4-5..." and "...line 6..."), which of course will cause me problems if I change the text format. For example, if I change the document's size, or if I change the class, etc, that manual reference won't be at line 4-5 or 6 anymore. So, any ideas of how should I proceed? Thanks for the attention.

linenomanual without reading question comments. Shall I delete and have you post the answer?