The book presents a study of transpersonal metaphysics (philosophical mysticism) of the 14th century German theologian Master Eckhart, the founder of the direction of "German mysticism," which had a significant impact on both the development of German classical philosophy and the irrationalist directions of European discourse of the 19th - 20th centuries. On the basis of German and Latin texts, Eckhart reveals the onto-epistemological and anthroposophical foundations of the doctrine, which carries productive ideas of spiritual development to the modern consciousness.