"The Ocean of Theosophy" by William Quan Judge

The Ocean of Theosophy, published in 1893, is a collection of articles Judge wrote for new and interested Theosophists at the height of the interest in anything Indian-Spirituality-like.  Blavatsky founded the Theosophical society, allegedly based on her own medium abilities and spiritual mastership.  Her first book was Isis Unveiled, which purports to reveal the secrets of the Egyptian mysteries and mysticism.  However, soon after, the ephemeral tastes of the society changed, and now people were fascinated with everything and anything coming out of India - Egypt being forgotten after the Napoleonic age. 

Quick to take advantage, Blavatsky wrote yet another long, rambling, confused and utterly useless book called "The Secret Doctrine" purportedly exposing the secrets of the Hindu mysticism.  The vast majority of experts on the subject since have rejected the contents as pure fiction, based on a little bit of reading.  What Blavatsky had going for her was that at that time the overall public knew next to nothing about Hinduism/Yoga/Vedanta etc. 

Judge was one of the co-founders of the Theosophical Society, together with Olcott and Blavatsky.   he died in his 40s, but not before leaving a large volume of Theosophical literature.  His explanations in this book draw from The Secret Doctrine, and are somewhat in line with Vedanta and Yoga scriptures, but with plenty of personal ramblings, attacks against nay-Sayers, exalting the "Secret Masters" whom Blavatsky made up and in general espousing of a worldview where humans are unworthy playthings of much larger powers.

Judge peppers his sleep-inducing pages with attacks on Darwin, evolution and other, then-new, but today proven beyond doubt, scientific theories which makes him sound like a whiny apologist for superstition and lack of scientific training.  Overall, read this book only if you really have a good reason.  Otherwise, today we're not limited to the Theosophical muddled interpretation of Vedanta and we can get the same or better knowledge of the concepts from directly translated source works and many modern experts in the field.