Bring to your mind a past occasion of inner joy and happiness, writes Matthieu Ricard in his new book Happiness: A Guide To Developing Life's Most Important Skill. "Recall how you felt. Consider the lasting effect this experience has had on your mind, and how it still nourishes a sense of fulfilment." Ricard, French translator and right-hand man for the Dalai Lama, has been the subject of intensive clinical tests at the University of Wisconsin, as a result of which he is frequently described as the happiest man in the world. As a young man, Matthieu Ricard, 60, was regarded as one of the most promising biologists of his generation. He completed a starred PhD at the Institut Pasteur under the supervision of Nobel prize-winner Franois Jacob, but abandoned his scientific career in 1972, when he moved to Darjeeling. There, he devoted himself to studying under ... a Tibetan master. He has been a monk, and celibate, since he was 30. Developing happiness, Ricard argues, is a skill. Most people exist like beggars, "unaware of the treasure buried beneath their shack". We can develop our potential as if "polishing a nugget" and eventually ... achieve happiness. Ricard's book exudes inspiration and intelligence, qualities embodied in its author. Happiness ... contains simple exercises designed to help the reader achieve the same sort of composure that radiates from Ricard himself. "Ultimately, it's how your mind relates to the world that determines whether you're miserable or not. You have to ask yourself: is my happiness dependent on other people?"