2. Consciousness in Sleeping and Waking States

> The extreme brevity necessitated by a summarization of material quite sufficiently abstruse to begin with nevertheless leaves this second edition with the same goal as the first, namely, to serve as a preliminary text requiring further exegesis in the form of lectures. The title “encyclopedia” usually presupposes a less rigid adherence to scientific method and a more general structuring. But it lies in the nature of the subject matter that logical aspects must remain the basis of the presentation. > There were all too many occasions and provocations that seemed to require me to clarify my philosophical position with respect to the spiritual and the insipid concerns of contemporary culture, a thing to be undertaken only exoterically and only in a preface; for even if these concerns claim a relationship to philosophy, they do not do so scientifically, which means not at all; they approach it from without, and remain outside it. It is uncongenial and mistaken to involve oneself in a situation so alien to science. All the clarifying and explaining one might do fails to further that insight which can alone form the object of true knowledge. But it may be useful or necessary to comment on various phenomena.