Buch der heiligen Dreifaltigkeit, c. 1430, Germanisches Nationalmuseum
"Truly, without falsehood, a certain truth: that which is below is like that which is above, and this is the whole miracle. The stone is not a stone: brother and sister, body and spirit, lime and water, male and female, king and queen. And Hermes says that our stone consists in two natures. It is of the nature of air, and in twelve months and in one day it is transformed; its day is the burning of fire in the morning, and afterward it is the sun and the moon, and the purifying wind by its own operation, within and without, air and earth. The philosophers have explained it in various ways. It is nothing other than a beautiful discovery, the operation and maturation of the seven. Each part acts according to its nature, and through them all metals are mixed. The seven complete the work, and gradually it is elevated; the seven are mingled and exalted, becoming white and red, without deceit. Thanks be to God. This is the true magnet, the unity of the materials."
On the left side is written: horn of the dragon, water, fire, the color of fire. On the right side is written: air, this is the color of air, clouds, this color is clear air, clear air. Beneath the left plant is written: earth, the color of earth. Beneath the right plant is written: burned earth. Between the two dragons is written: the concord of the brothers. Beneath the dragon is written: the dragon itself is the serpent in which the great secret lies hidden. Beneath the central figure is written: here is the double man, the united matter.