What happens on the subway?

On the subway, Montag feels numb. He remembers a time as a child at the beach when he tried, unsuccessfully, to fill a sieve with sand. Now he realizes he’s holding the Bible open on his lap. If he can read the text in front of him and memorize it, he thinks that he can keep some of the sand in the sieve. He tries to read a passage but he’s distracted by an advertisement for toothpaste. He stands up, screams for the advertisement to shut up, and waves the Bible, alarming the other passengers, before he gets off.