The esoteric knowledge contained within the ancient tradition of Alchemy. The Western equivilent of Tantra.
“The philosophy of Sexual Alchemy has its principles in the school of the Essenes, in the school of Alexandria, in the teachings of Pythagoras, in the mysteries of Egypt, Troy, Rome, Carthage, Eleusis, as well as in the wisdom of the Aztecs and Mayas, etc. The procedures of the science of Sexual Alchemy must be studied in the books of Paracelsus, Nicholas Flamel, Raymond Lully. We also find these procedures hidden within the veil of all symbols, in all the hieratic figures of ancient hieroglyphics of many ancient temples, as well as in the Greek and Egyptian myths.” - Samael Aun Weor, The Aquarian Message