The most important relationship you have is with yourself—it's with this voice in your head that is constantly rattling every waking hour. It's this crazy roommate living inside your mind who's always chattering [and] never shuts up. And you can't control these thoughts—they just come up out of you don't even know where ... Those conversations you're having in your head all the time—that is your world ... That's going to determine the quality of your life more than anything else.