In this new translation of a work written in 1904, Steiner turns his philosophically trained scientific mind to the precise, phenomenological description of his own supersensible experiences and the supersensible phenomena revealed by them. It is a key work for anyone seeking a solid grounding in spiritual reality.

He provides a comprehensive understanding of human nature, beginning with the physical bodily nature and moving up through the soul nature to our spiritual being.. This then leads to the experience of the human being as a sevenfold interpenetrated being of body, soul, and spirit. He gives an extraordinary overview of the laws of reincarnation and the workings of karma as we pass from one life to the next. After showing the different ways we live during and after this life in the three worlds of body, soul, and spirit, he concludes with a succinct description of the path of knowledge by which each of of us can begin to understand the marvellous and harmonious complexity of the psycho-spiritual worlds in their fullness.