This work, essentially Rudolf Steiner's doctoral dissertation,subtitled "Introduction to the Philosophy of Freedom," isjust that an essential work in the foundations of spiritualscience. In it, the epistemological foundations of spiritualknowledge are clearly and logically presented.Originally published with The Philosophy of Freedom in asingle volume, this work is fundamental to an understandingof that work (currently published as Intuitive Thinking As aSpiritual Path) and to a more complete comprehension ofthe philosophical basis of Steiner's spiritual science.