"Our Deepest Fear" Quote - Was It Marianne Williamson or Nelson Mandela?

Though this quote has been attributed to many people and quoted in several movies, the original quote is from Marianne Williamson's book "A Return to Love."

The person who this quote is most frequently mis-attributed to is Nelson Mandela. However, the Nelson Mandela Foundation has confirmed that, to their knowledge, he has never spoken those words. You can verify this here, as well as read articles posted on Snopes or The New York Times.