One of Beatty s criticisms of the old woman and her books is that none of those books agree with each other. Obviously, author Ray Bradbury wants us to read a wide variety of books. What, do you suppose, happens when we read only books that align with our own world view?

We limit ourselves

Explanation:

With books it´s the same as with people: the more diverse the books you read or the people you meet, the more your mind opens up to different views of how the world is or could/should be. Totalitarian regimes - as the one presented to us in Fahrenheit 451 - can be succesful exactly in situations where everybody follows blindly one personal view (that of the leader) or, as in religious fundamentalism, one book.