Ficino, Marsilio - On the alchemical art - Chapter 01
Type of Spiritual Experience
A description of the experience
Of the generation of metals in the bowels of the earth.
The opinion and determination of all who philosophize rightly is the same: that all metals are generated by the vapour of sulphur, and of argent vive. Because when the fat of the earth being heated, finds the substance of water somewhat globulous, it as well by its natural virtue, as by the rays of the celestial bodies and the endeavor of heaven, as according to the purity or impurity of each, consolidated it in the veins of the earth into those most beautiful bodies, gold, silver, copper, tin, iron, and lead.