I. Soul and Spirit in the Human Physical Constitution

We look back over our life, at the series of images of our experiences to the point to which memory extends. But this whole stream of remembrances is interrupted every night by sleep. In the backward survey of our life the intervals of sleep are ignored. It does not occur to us that the stream of memories is ever and again interrupted by periods of sleep. The fact that it is so interrupted means that, without being conscious of it, we look into a void, a nothingness, as well as into a sphere that is filled with content.