the Corpus Hermeticum

This book, for which I'm not going to provide a link because the whole point of alchemy is to send unexpecting overcurious readers down their own rabbit-holes and where would the fun of that be if I just gave you it that easily?* is probably the foundational text, or at least one of the key foundational texts, for the Western Hermetic tradition by which a true alchemical practice is derived. It takes the shape of a conversation between Hermes and Thoth, on a range of matters - but dealing in considerable depth the natures of Cosmos, Mind, Being, God and Goodness; the language is potently symbolic but not such that it, I don't think anyway, obscures the underlying metaphysical things it is trying to talk about - though the very nature of alchemy means that what I have derived from the text might not necessarily be what any other reader might clearly be able to infer from the words alone; as such, I would not recommend this text with much gusto - despite feeling personally that it has an abundance of Truth contained therein - because for that truth to shine through in a proper way to the Imaginations of its readers they must have been prepared through the cosmic trip of their own life-inner-journeys - but if you have, as I was, been led to the discovery of this text through your own questings, then read it with generous discernment - as I sense this far down the rabbit-hole things do start getting strange, and those who read out of an intellectual voracity and a desire to Fully Comprehend risk dragging their minds and souls into the truly abstract and/or occult which are less than life-giving; but if you have been led here out of a humble expectancy, spiritual curiousity and openness - it may very likely have much of merit to say, but let me say here - nothing which has not been said elsewhere, in many forms and occasions, as the true & proper ground of any alchemical "fact" can only be known exactly as and where it is - which may well be just about everywhere, and if you do not already see that then reading a text like this might not necessarily help you do so, instead just furnishing the strangeness of your mind-soul's quest-loot with an additional bunglage to its burden, which will only be shed when you properly grasp what it's about. God is not gnosis. Nor is gnosis necessary for salvation: only Christ - but the Gnosis spoken about in this text, that is the gnosis of, and in, for and through such things as the mind-soul's Life in Jesus-God; is a real thing impossible to lose when it is found, for it is the truest surest ground of a mind-soul that can be known, felt or said to exist - all of which is to say, be honest in your self-examinations, and quest carefully.

* That said, you do have my assurance that PDFs of it are available online, or it in book form. I read the translation by G.R.S. Mead, if you're interested.