Best-selling author Marianne Williamson talks about the 20th anniversary of her groundbreaking book "A Return to Love." A global phenomenon, the book went on to sell more than 1.5 million copies in the United States and has been published in 23 different languages. The New York Times best-selling spiritual guide explores how love is the key to inner peace. In the book, Marianne writes that our deepest fear is not that we are inadequate; it's that we are powerful beyond measure. It's a passage that remains one of Oprah's favorites. Marianne explains why we fear our light more than our darkness and how everyone has a built-in platform to connect with others. She also shares how living in the present, without fear or resentment, can bring you closer to inner peace.