Volume Eight of The Collected Works of Ken Wilber includes:

- In The Marriage of Sense and Soul: Integrating Science and Religion (1998), Wilber takes on the centuries-old problem of the relationship between science and religion. After surveying the world's great wisdom traditions and extracting features they all share, he offers compelling arguments that not only are these compatible with scientific truth, they also share a similar scientific method.
- One Taste: The Journals of Ken Wilber (1999) is a lively and entertaining glimpse into a year in the life of Ken Wilber--as well as a thought-provoking series of short essays on current trends in spirituality and psychology, daily reflections, meditation experiences, and advice to spiritual seekers.