Stacy Kim, a social scientist and life coach, argues in her new book that envy can serve as a useful signal rather than a vice to suppress. Kim writes that unexamined envy leads people astray, but when people understand what the feeling reveals about their desires, they can use it to set and achieve goals. The book, titled "Envy: Why Wanting What They Have is the Key to Getting What You Want," draws on social science research, philosophy and Kim's work with coaching clients. Kim suggests asking yourself whether what you envy in others is within your own reach. She also recommends identifying which specific areas matter to you and noticing how long the feeling lasts and how intensely it surfaces, as signals of importance.