"The sulfur of the philosophers must be composed of philosophical mercury. And although many seek and determine what the sulfur of the philosophers is, they must know that, as the author of the Hidden Philosophy says about it: "I am the sea, venerable and renowned, the clear emblem of my species, born from the pure origin of water, which surrounds the whole earth and moves ceaselessly, with my fluids nourishing milk and blood; thus, through this work, both are transformed into gold or silver." Therefore, this figure shows not only the matter and the closest material to the Red Stone of the Philosophers, but also that the mercury and sulfur of the red philosophers are one and the same." Theoria et praxis lapidis philosophorum. Vol. II, p. 1700, by Johann Friedrich Rain.
