In the 21st century, there is a growing interest in the epistemological foundation of anthroposophy as an individual and independent approach to the spiritual world. I have been working with anthroposophy since 1983, and publicly since 1994. I have published many books and, over the past seven years, have given countless lectures and seminars in several European countries. Now the question has arisen of providing a philosophical-spiritual foundation for the content of the New Mysteries as presented by Rudolf Steiner in 1924. Of course, there can be many objections to this, and I can formulate them myself. However, after articulating these objections, I conclude that it is extremely important to provide this philosophical-spiritual foundation for the New Mysteries. And since I believe I am capable of doing so, I hereby undertake this endeavor.