Learn

Have you ever read a book, that after you finished reading it, you kinda like keep it away, not planning to take a look at it again ? 

Well, that shows that the book, doesn't really have something for you to hold on as a guide. There's nothing to be learnt from the book. Even if it has something, they might just stick in you for just that one time.

Now, have you ever read a book, that after you finished reading it, you can't help yourself from opening it again, reading the same line, the same phrase but with different understanding towards the meaning ?

Clearly, that shows how strong and influential the book is towards yourself. You can't stop from learning something from that same book, same contents. It kinda like, keep telling you something from time to time, in different situations.

So, choose what to read. Choose what to learn from.