The Power of Now: A Guide to Spiritual Enlightenment is a book by Eckhart Tolle. The book presents itself as a discussion about how we interact with ourselves and others. The concept of self-reflection and presence in the moment are presented along with simple exercises for the achievement of its principles. Its core message is that people's emotional problems are rooted in their identification with their minds. The author writes that an individual should be aware of their "present moment" instead of losing themselves in worry and anxiety about the past or future.