Final answer:
Captain Beatty says that every fireman gets an 'itch to do' at least once in his career, referring to the curiosity and temptation felt by firemen to read the books they are supposed to burn in the dystopian society depicted in Fahrenheit 451.
Step-by-step explanation:
In Ray Bradbury's novel Fahrenheit 451, Captain Beatty tells Guy Montag that every fireman gets an 'itch to do' at least once in his career. Beatty is referring to the curiosity and temptation felt by firemen to read the books they are supposed to burn. In this dystopian society, books are forbidden and firemen are tasked with destroying them.
Beatty explains that firemen may initially be drawn to the power and control they have over knowledge, but eventually they become curious about the content of the books they are burning.