Faber has a 3-principle response for Montag when Montag asks about what is in these books that is so valuable, so forbidden that people would go to such extremes as to extinguish them.
Faber says that books have quality of detail. This is that ability to make us think and feel and experience and relate. Next, reading books requires the "leisure to digest" them. So many students read to get to the end of the reading assignment. Faber insists that reading is so much more than that. Sometimes this takes time and the ability to relax so you actually can think about what you're reading and process it. Finally, a reader needs to be able to act upon what they read. If not brave enough or able to act upon what has been read after thought about and processed, what is the written word worth? If it's mystery is not going to be discovered, why read it in the first place? The ability to carry out action based on what was learned was easy for Faber to talk about, but ironically, it was difficult for him to carry out.