The power of today is the spiritual book of Eckhart Tolle.
To go the way described in The Power of Now, you must abandon identification with your analytical mind and the false self created by it, the ego. We are not our thinking. We can rid ourselves of psychological pain. Your authentic strength is only mobilized by surrendering to the Now. Here we find joy and are able to embrace our true self.
We also find out that we are already 'whole' and 'perfect'. As you read this book, many will find that the greatest blocks to getting into the Now are our relationships, that is, the way we are in our relationships. However, relationships can also be an access to enlightenment, provided we use them wisely so that they contribute to our awareness and thus enable us to give more love.
If we can be fully present and take every step in the Now, we can experience the reality of things like 'surrender', 'forgiveness' and 'the unnameable'. In this way we can open ourselves to the transforming experience of The power of the Now.