The first book of Halevi's that I read was *School of the Soul: Its Path and Pitfalls*, which he published several years after this book. *School of the Soul* describes the development of spiritual groups, while *The Work of the Kabbalist* focuses more on the individual.
People who have heard of (or experienced) the Kabbalah as a strictly Jewish path full of precise rules will find this book refreshing (or perhaps shocking). Although Halevi provides several detailed diagrams based on the traditional Etz Chaim (tree of life), he also devotes a large portion of the text to exercises that seem primarily imaginative.
A key theme in Halevi's books is the awareness that Kabbalah is a living tradition which must adapt to changing circumstances. This flexibility dovetails with his inclusive, welcoming attitude to readers who belong to traditions other than Judaism.
From the outset, the reader will recognize that this book is rooted in many years of personal experience as both student and teacher. Halevi's wisdom and compassion shine through in every chapter, but each reader will naturally find "good parts" that resonate with his or her individual perspective.
I take the liberty of quoting a paragraph from his chapter on Integrity:
"The practice of integrity is vital to a spiritual tradition, for it not only safeguards the individual, but the Work. Over the last few centuries Kabbalistic ideas have been stolen and adulterated by those who only sought magical powers, with the result that an image of dangerous hotchpotch has overlaid the real purpose of Kabbalah. Because of this, the tradition has fallen into disrepute amongst Jews who see it as a degenerate form of occultism. Thus, by the last century the reputation of Kabbalah had fallen from high respect during its most original period in Medieval times to a superstitious repetition of magical formulae. This happened because the Work was not protected in the right way. It is not secrecy that guards the tradition, but correct conduct, and if this is not present, then people do not find the door to the inner path which is their birthright. The lack of real spirituality today amongst clergy has made many Jews and Christians turn to the Eastern religions for their esoteric instruction. This is sad because they have within their own Western traditions all the higher knowledge and methods they need for the development of the Occidental psyche and spirituality."