What is the tone for the book Fahrenheit 451?
Burning books should be a no-no.
The book was tilted "Fahrenheit 451" because it is said that this is the temperature at which books burn (temperature at which paper ignites). A literary license was taken by Ray Bradbury when he named "Fahrenheit 451" (novel, 1953) after the temperature at which paper ignites (the range is about 218°-246°C or 424-474°F).
How is the quote Fahrenheit 451- the temperature at which book paper catches on fire and burns important?
Fahrenheit 451 is the temperature at which paper burns. If Bradbury hadn't put book burning in the book it wouldn't have any subject matter, there wouldn't be a book at all - you would have effectively burnt 'Fahrenheit 451'. Basically Ray Bradbury loves books and he's making a point about how important literature is for the imagination and freedom of expression.