Maybe this has been covered elsewhere, but maybe if it has, there are some authors or books everyone hasn't seen and shared.
The Occult: The Ultimate Book for Those Who Would Walk With the Gods by Colin Wilson was written 30 years ago, or so. He's done a lot of work on the subject since this one came out, changed his views on some things, but even on this one I consider Wilson to be the most objective investigator of the occult, metaphysics, mysticism, I've ever encountered. I recommend this book.
Beyond the Occult, Colin Wilson, was written much later. Tells what he's learned during the intervening years. These two books will addict you to Colin Wilson, but it's an addiction you will love.
Hokay. Those are a couple I'd recommend. If anyone would like to talk about them, or would like to recommend some of their own favorite authors, I'd be interested in knowing what you have to say about them.
Jack