This is actually a 3 volume set of publications: a text, a workbook along with a teacher's guide, that I read from continually, and possess for that previous 31 yrs. It is among the most important spiritual messages of our time. The Course combines 21st Century psychology with non-dualistic metaphysics. https://www.youtube.com/channel/UCXpL4OXSmktqlP6_S5p5jIQ