The starry vault of heaven is in truth the open book of cosmic projection, in which are reflected the mythologems, i.e., the archetypes. In this vision astrology and alchemy, the two classical functionaries of the psychology of the collective unconscious, join hands.
alchemyquotes
Perhaps because alchemy combines the ancient, Gnostic focus on the immaterial and transcendent soul, or spark, with the modern, scientific-like focus on the transformation of worldly matter, it serves to connect the two. Despite his professed closer kinship to alchemy.