The Philosopher’s Stone is a legendary concept, sometimes referred to as a substance, sometimes referred to as the purified human, and sometimes referred to as an actual stone, itself representing the immovable and incorruptible seed of the Infinite at the core of the purified human. As stated above, another of its correspondences is the ceramic that results from the full alchemical treatment of the noble metals. In other words, "ceramic" is a type of "stone." “The Sword in the Stone” is one such allegorical reference, as were the wildly popular Grail Romances. Can you pull the sword from the stone? Can you reach the deep interior of a given thing and release its spirit? Do you have the know-how, the art, the purity of being? Purity of being is the only passcode needed. Possibly its most consistent reference is made regarding its ability to turn base metals, particularly lead, into gold. No substance can do that. Only the alchemist can do that, so in that case, the alchemist is the Philosopher's Stone (this happens to be true). A close second is that it is believed to be the mysterious and elusive “elixir of life,” possible of achieving physical immortality by raising the body to a phase of incorruptibility, written about in ancient documents all over the world. That's a classic Red Herring, to draw in the starry-eyed and egoistic. The incorruptible thing is the spirit, and it's already immortal, but High Alchemy connects you to its immortal world. That's the whole point. The perfect merger between matter and spirit. I'll repeat for emphasis: It's the perfect union of matter with spirit (making the Adam Kadmon). It has been the central symbol of alchemical mysticism, the labor, process and ongoing discoveries of which is known as “The Great Work.” However, the Great Work, by definition, is the theoretical pinnacle of any alchemist's body of work, and is the objectified fact of transmuting base metals into gold. It can be done, and I'll leave it at that. What do I personally know the Philosopher's Stone to be? The purified alchemist, is the short answer, and it's also the immovable and unchaging Presence at the core of the fully purified human. Remember, this is about purification and nothing more. The purer you are, the higher you go. It's so important to know that