Steiner's original contribution to human knowledge was based on his ability to conduct spiritual research, the investigation of metaphysical dimensions of existence. With his scientific and philosophical training, he brought a new systematic discipline to the field, allowing for conscious methods and comprehensive results. A natural seer from childhood, he cultivated his spiritual vision to a high degree, enabling him to speak with authority on previously veiled mysteries of life. Topics include: the evolving human being; cosmos as the source of life; plants and the living earth; farms and the realms of nature; bringing the chemical elements to life; soil and the world of spirit; supporting and regulating life processes; spirits of the elements; nutrition and vitality; responsibility for the future.