This is actually a 3 volume list of textbooks: a textual content, a workbook and a teacher's guide, that I study from constantly, and have for the past 31 decades. It is probably 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