fludd's application of his mystically inclined tripartite theory to his philosophies of medicine and science was best illustrated through his conception of the macrocosm and microcosm relationship. the divine light (the second of fludd’s primary principles) was the "active agent" responsible for creation. this informed the development of the world and the sun, respectively. fludd concluded, from a reading of psalm 19:4—"in them hath he set a tabernacle for the sun"—that the spirit of the lord was contained literally within the sun, placing it central to fludd’s model of the macrocosm. remained in manuscript. as the sun was to the earth, so was the heart to mankind. the sun conveyed spirit to the earth through its rays, which circulated in and about the earth giving it life. likewise, the blood of man carried the spirit of the lord (the same spirit provided by the sun), and circulated through the body of man. this was an application of the sympathies and parallels provided to all of god’s creation by fludd’s tripartite theory of matter.