In the architecture of Rudolf Steiners great cosmological temple this extraordinary course of lectures on spiritual beings forms the central pillar with other important texts such as the fourth chapter of An Outline of Esoteric Science The Spiritual Hierarchies and the Physical World and Inner Experiences of Evolution. These works outlining a revolutionary angelological cosmology lie at the heart of Steiners mission to transform our understanding of the world by laying down a new nondual phenomenological path to a contemporary divinespiritualphysical cosmology that is angelological and theophanic. For Steiner what constitutes the world are beingsincluding the ground of the world itself the Father being. Steiners cosmology or angelology is personal and it is known in relationship therefore he presents it in terms of states and deeds of conscious and of the divinespiritual beings whose states and deeds they are. The spiritual world is thus always a world of beings. The twin realizationsthat I am an I and that reality is constituted of other Ibeingsgo together. Cosmology is angelology. Spiritual beings define experience of the nature of reality. In these lectures the reader is led through a series of meditations to recognize these spiritual beings and come to know their deeds. Steiners approach is contemporary in that while continuous with the most ancient understanding of the cosmos he discovers it for himself out of his own experience and consciousness and expresses it in his own words with a logic and language appropriate to our time. Thus he teaches us his readers to do the same.