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Deepak Chopra is the kind of person whose writings have a way of crawling from the page and into the cultural zeitgeist, travelling far and wide until they become so influential, it feels like they've been there all along.
It's likely you've absorbed the 78-year-old's work, even if you're entirely unaware of it. He was a prominent figure in the Transcendental Meditation movement in the 1980s, and went on to teach celebrities like Oprah Winfrey, Elizabeth Taylor, Michael Jackson and Madonna how to meditate.
He's a New York Times best-selling author, having written over 90 books, and for almost 40 years he's been a pioneer of New Age spirituality. Chopra writes extensively about how we take the miracle and mystery of our existence for granted, how many of us are stuck in social conditioning that limits our potential, how peace, and not happiness, should be the ultimate pursuit, and how true fulfilment comes only from getting in touch with your spiritual identity. He's responsible for pushing concepts like transcendence, abundance and manifestation into the mainstream, and while some of his ideas - particularly those around alternative medicine - are controversial, he has undoubtedly informed how millions of people worldwide think about their own wellbeing.
So, when I found myself sitting opposite him in a podcast studio a few weeks ago, with an hour to speak to him about happiness, I barely knew where to start. But I usually begin my interviews on But Are You Happy by asking my guests about whether they had a happy childhood, and so that's what I did.
"I did grow up in a very happy family," Chopra said. "My father was an Army doctor, my mother was a storyteller, and they were always celebrative about everything. Looked at every challenge as an opportunity and enjoyed life."