Arnold Geulincx (1624-1669) was one of the originators of modern occasionalism theory. Besides philosophy, he studied medicine. Although no sources confirm whether he practiced as a physician, he certainly used his medical knowledge in philosophical works. The present article discusses his concept of man as a unity comprised of body and spirit. The unity is described by Geulincx as human condition. It is given by God and it lasts from conception till death. Spirit as superior substance in human condition has to care for man, both as a unity of body and spirit and for body alone. Fulfilling duty is applied to obtain that. While defining human condition on philosophical grounds and presenting the range of particular duties, Geulincx refers to medicine.
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