it can become you if you keep feeding it such.
i think what that means is what you read can educate & influence you
you are influenced by everything -- the friends you hang out with, what you listen to, and the places you hang out. if you are loud and obnoxous, you bring more of that to yourself. If you are loving and assist others, you will reap the rewards of that in your own life.
Certainly what goes into your mind influences it, positively or negatively.
bulldust, someone's personality shouldn't be ba<x>sed on what books they prefer to read.
That's a bullshit saying people say to tell you that you're different in a bad way. It's because they're completely clueless as to the knowledge or learning you have experienced from that book you've read.
If you read only grocery store thrillers, you and I can't be friends.