I just saw this quote in Olivia Judson's column in the New York Times. She's explaining why she's taking a break from writing:
Writing in this space is the most gratifying job I’ve ever had, but also the toughest. It’s like owning a pet dragon: I feel lucky to have it, but it needs to be fed high-quality meat at regular intervals . . . and if something goes wrong, there’s a substantial risk of being blasted by fire.