“Although there were four elements (earth, water, fire, and air) and four qualities (hot, cold, dry, and moist), there were only three colours: black, white, and red. Since the process never led to the desired goal and since the individual parts of it were never carried out in any standardized manner, the change in the classification of its stages cannot be due to extraneous reasons but has more to do with the symbolical significance of the quaternity and the trinity; in other words, it is due to inner psychological reasons.”