Near the end of the book, Beatty forces Montag to burn down his own house in response to him continuing to keep the books despite all his warnings. He scolds Montag and explains why he believes books are unnecessary, and how he dislikes the people that believe otherwise. Ultimately, Beatty strikes a nerve within Montag and gets set on fire by him, leading to his death.
Old Montag wanted to fly near the sun and now that he's burnt his damn wings, he wonders why. Didn't I hint enough when I sent the Hound around your place?
What is fire? It's a mystery. Scientists give us gobbledegook about friction and molecules. But they don't really know. Its real beauty is that it destroys responsibility and consequences.
Why don't you belch Shakespeare at me, you fumbling snob? `There is no terror, Cassius, in your threats, for I am arm'd so strong in honesty that they pass by me as an idle wind, which I respect not!
This scene begins with Beatty besetting Montag for not having done away with the book he had kept despite Beatty's efforts to stop him.
We never burned right..
Beatty had wanted to die. He had just stood there, not really trying to save himself, just stood there, joking, needling ... instead of shutting up and staying alive ... [he got me] mad, and then ....
Beatty continues to elaborate on how books are nothing but lamentable—they bring forth information and thought-provoking ideas, much unlike what their society is used to.
During his speech, he quotes phrases from books, displaying his knowledge of literature; he read books, despite hating them so fervently.
Once Beatty has upset Montag enough, Montag turns his flamethrower on the other before he could think about it, setting him aflame and consequently ending his life.
After leaving the site, Montag starts talking to himself about Beatty's actions before the murder, questioning his actions and how he did not try so hard to stay alive.