"The principle of fire is the root, and it grows in its root. It has in its proprium sour, bitter, fierceness and anguish. And these grow in its proprium in poison and death the anguished stern life, which in itself gives darkness, owing to the drawing in of the harshness. Its properties make sulphur, mercury, and salt; through the fire's property makes not Sul in sulphur, but the will of freedom makes Sul in sulphur, while the principle goes forward."
-- Jacob Boehme (1575-1624)
(thanks to Phil Norfleet for the quote)