In Fahrenheit 451, can you explain easily about what is the signifance of Mrs.Phelps's reaction to "Dover Beach"?

The overwhelming message of this story is the way that
humans now find themselves shockingly empty of anything except for surface level
insincerity and emotions, as demonstrated by Mildred's suicide attempt at the beginning
of the tale. The way in which humanity is trying to protect itself from, in the words of
Mrs. Bowles, "poetry and tears, poetry and suicide and crying and awful feelings, poetry
and sickness; all that mush!" has actually only served to create a massive and intense
emptiness that Mrs. Phelps becomes aware of as she listens to "Dover Beach" being read
to her, especially as she is left with the image of a world where "ignorant armies clash
by night." Taking books and literature away from the world and replacing it with
"families" on "screens" that dominate people's lives only serves to highlight the
emphasis within them. The sudden introduction of real literature into this environment
touches Mrs. Phelps in a way that she cannot be touched by the contemporary
entertainment and also reveals how essential literature is to the human
soul.