As a pupil of my late husband and in later years collaborator in his more esoteric studies, I take this opportunity to say a few words in regard to himself and his work. Moreover, since his death at the end of 1918, I have received innumerable visits, letters and enquiries from all parts of the world from students of his writings. As most of these questions would appear to bear on his more esoteric knowledge, I will quote his own words (see page 13, paragraph 22, of the Introduction): "The term 'Unwritten Qabalah' is applied to certain knowledge which is never entrusted to writing, but communicated orally. I may say no more on this point, nor even whether I myself have or have not received it."

Simultaneously with the publication of the Qabalah in 1887, he received instructions from his occult teachers to prepare what was eventually to become his esoteric school. In this connection were associated with him the late Dr. Woodman and the late Dr. Wynn-Westcott, both eminent Masons and Qabalists. They, with my husband, held high Office in the Societas Rosicruciana in Anglia, and other Masonic bodies.

Since the year 1887, when the first edition of the Qabalah Unveiled appeared, the whole attitude of the thinking world has changed considerably towards occult philosophy and science. The gigantic strides made by science since the end of the last century, the staggering facts disclosed by its practical demonstrations, simultaneously with the development of the great occult movement, must strike all thoughtful people as the evidence of some imminent change in the evolution of this planet. Material science would appear to be spiritualizing itself and occult science to be materializing itself. If not clasping hands, they are certainly making tentative attempts in that direction. The Ancient Wisdom, the Sacred Books, taught. that we cannot understand Matter without understanding Spirit, that we cannot understand Spirit without understanding Matter. That Matter and Spirit are only opposite poles of the same universal substance. All through the Qabalah runs this axiom: "that Malkuth is in Kether, that Kether is in Malkuth." The same idea is repeated through the Gnostic teaching: "the earth that is in the heaven, the heaven that is in the earth."