Let's say I've directed that [writing] energy into writing my latest book but suddenly, I really want to write about an onion. I don't say to myself, "No, you have stay on the subject," because I know that the longer I stay on the subject the more boring I get. So, if my mind wants to write about an onion, it might be a deeper way to go into what I'm working on, even though it might seem irrelevant. This is how I've learned to follow my mind.