The Book of Concealed Mystery is a mystical and esoteric text translated and annotated by S.L. MacGregor Mathers. The book is believed to have been written by the 13th-century Kabbalist Rabbi Eleazar of Worms and contains a series of teachings on the nature of God, the creation of the universe, and the spiritual path towards enlightenment. The book is divided into three sections: the first explores the various names of God and their significance,...