Some books are to be some few chewed and digested?

"Some books are to be tasted, others to be swallowed, and some few to be chewed and digested. " means: -

* Some books you just need to skim, to get a taste of what they have to say.

* Others, you can read more slowly, taking in more and making sure you understand, but without the need to memorize

* But, there are a few special books that you really need to dig into, reading and re-reading until you have internalized their message deeply