"The Book of Abramelin" is a 15th-century grimoire attributed to the Egyptian magician Abramelin. It outlines a system of magic and spiritual development, focusing on the attainment of knowledge and communication with one's Holy Guardian Angel. The text is divided into three main sections, detailing the necessary preparations, rituals, and the process of achieving this connection. The book emphasizes the importance of personal discipline, ethical conduct, and the use of specific rituals to achieve spiritual enlightenment. It has influenced various occult traditions, including Hermeticism and Thelema, and remains a significant work in the study of Western esotericism.