Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Not easy, but worthwhile

Blavatsky's work is not easy to read. Suffice it to say, you will probably find yourself reading and rereading some pages to understand her well. In spite of that, her work has been incredibly important to the new-age and metaphysical movement. When you read this you will come to find out why the "new age" isn't new at all and that the topic of metaphysics has been something that has endured for thousands of years.I am suprised that so many modern authors (like Tolle) avoid mentioning her work. My guess is becuase it shows that they are not as new and original as they would like to make themselves appear.