The Power of Now: A Guide to Spiritual Enlightenment is a book by Eckhart Tolle. It is a discussion about how people interact with themselves and others. The concept of self-reflection and presence in the moment are presented along with simple exercises for the achievement of its principles. Published in 1997, the book was recommended by Oprah Winfrey and has been translated into 33 languages. As of 2025, the book has sold 16 million copies worldwide.