This is a book describing three introductory, yet important, ritual practices that are supposed to cleanse the practitioner's mind and spirit, so there's a conscious link and communication with Real Self, and it eventually leading to complete abandonment of the false self.
I gave it a 3 star rating, because even though it describes the rituals, how and why they work in a manner where it's all easily understandable even for someone who's new to occult literature and practices I am still against this path. Mr. Regardie compared to the degenerate Crowley seems like a decent man, who actually led a moral life and honestly wanted to help others trough his writing. He doesn't mystify the topic even further and LARP like Crowley.
I believe that there's no need for a person to perform these rituals, cloud his mind with Jewish, Hebrew expressions, evocations, angels, archangels, Tarot, astrology etc. You don't need to draw pentagrams and imagine rays of light... It might work for someone, it might make sense, but there are superior, safer practices.
I used a wrong expression, I don't just believe that there's no need for it, I experientially know it. Most of the benefits of the practice Mr. Regardie lists in the book are achievable by far less confusing and dangerous paths, such as Theravada and Zen Buddhist practice, Christian Hesychastic practices and real Yoga, strictly based on Yoga Sutras and almost nothing else. There are many traditional paths, that produced Saints. You don't have to be devoted to a single religion/philosophy/path, but it's the best to chose one and fully devote yourself to it. My practice is mostly based on Yogic practices and Christian Mysticism, which don't have many, or almost any, conflicts. I also highly respect and value Theravada and especially Zen Buddhism.
Many of spiritual seekers today are intellectually gifted and really like delving deep, finding new challenges, thinking and talking about cosmologies, symbols, astral beings, Tarot, astrology... I'm the same, but my own practice is giving me all the answers I need and keeps me on The Narrow Path. I never actually had the need to bother with any of these things besides researching them in order to be able to understand all the different Paths that people follow and getting a theme to contemplate or some new information that will be useful to me in the future. I would like to help others when I reach a higher level than I am on now, God willing, so I have to know and understand many, many things.
In closing, I have to say that I think that these Western occult, mostly Jewish and Egyptian inspired practices should be avoided. I don't think they produced many enlightened people or even one, they usually breed even more intellecualism, elitism (because they are usually performed by secret, invite-only, groups) and don't lead a person to absolute love and re-absorption into God. They usually create Luciferian-minded people, very capable in the material, who misuse the knowledge that they obtain, moral relativists, like most Freemasons, who only care about their own. Aleister Crowley is the most influential of these people and he was a heroin addict, a sexual deviant, liar and abandoned his children.
There's simply no need for these paths, make silent meditation, Prayer and self-observation your main 'practice methods' (practice lasts 24h every single day) and you will safely advance, at the pace that's right for you and get knowledge that's unique to you and your situation. We need to cleanse ourselves of the intellectual ballast we carry, not add even more to it, but it's easier said than done, especially today.
I hope we persevere.