In "Fahrenheit 451," what are three necessary things that Faber tells to answer Montag's question about books?

Faber explains that you need books for three reasons:

1.  "They have quality", which means that they show all of the layers of truth, instead of just skimming over it and presenting it on one way.  They have textures, pores, layers, and because of it, can tell more truth than anything else can.

2.  "Leisure...time to think."  Books actually make you slow down, and ponder the meaning of life.  You can process them instead of having them shoved down your throat, as with the t.v. walls.  With movies, everything is presented for you, and you are told, convinced, through sensory experiences, to think they way they want you to.  Books simply present the information, and you have the leisure to think about it as you please.

3.  "The right to carry out actions based on what we learn from the interaction of the first two."  Once we have experienced quality and layered truth, had the time or leisure to process, then we can act on what we have learned.

Montag learns all of this from Faber, and they decide to take #3 literally, to start printing books underground again, and distributing them.  Unfortunately, their plans don't pan out.