The Mysteries of the Qabalah is written from a Theosophical point of view. This text explains the signatures of each Hebrew letter, the use of techniques such as permutation and numerology to find deeper meaning in the sacred writings, and the history and a bibliography of Jewish mysticism. The Sepher Yezirah is the central text of the Qabalah, in which the principle of the letters is explained, and the associations between the other letters and the tree of life are explained.