Instruct: Classify a given Amazon review as either positive or negative.
Query: outstanding still relevant keystone

99 years after first published and, in my opinion, it stands as the keystone, central masterpiece that analyzes mysticism without trappings of religious dogma. If you're looking for a quick read, well, I didn't find it here. It takes time to properly digest her writing. Also, if you're looking for a "cookbook" guide to becoming a mystic, this isn't it. Where mystical books range from the purely scholarly (say, "0") to the purely applied (say "10"), I think that this leans toward a scholarly analysis (say, "4"). I find it brilliantly written. Anyone with an interest in mysticism, regardless of foundational religious beliefs, should find nothing to be of offense. In fact, I imagine it will be very highly regarded by all who read it. Mystics, theology students, and students of human nature should find this book very beneficial. I highly recommend it. I give this an "A+".