"The Idea of the Holy (1923) by Rudolf Otto is a foundational work in the field of religious studies, particularly in the study of the numinous—an experience of the divine that transcends rational understanding. Otto examines the nature of religious experience, arguing that it is defined by an encounter with the ""numinous,"" a feeling of awe and reverence that goes beyond the rational or conceptual. He distinguishes between the ""mysterium tremendum,"" the terrifying and overwhelming aspect of the divine, and the ""mysterium fascinosum,"" the captivating and attractive aspect. Otto's work laid the groundwork for later studies of religious experience and influenced many theologians and philosophers. This leather-bound edition of The Idea of the Holy is a significant work for anyone interested in the philosophy of religion, theology, or the psychological and emotional dimensions of faith."