Terms like groundbreaking and life-changing are often used to describe books, but not always accurately. They are when describing The Power of Now, which has become a genuine cultural phenomenon. Oprah Winfrey keeps it at her bedside and calls it “one of the most valuable books I’ve ever read.” Katy Perry says it inspired her song “This Moment.” Director Tom Ford asked everyone in his film A Single Man to read it – and on and on.