Great Religions and Philosophies. : Greek Philosophy. In the 6th century B.C, there began a dualism in Greek Philosophy. The development of Greek Philosophy became a compromise between Greek monistic and oriental influences, in other words, a combination of intellectualism and mysticism. Thus began the pre-Socratic philosophy. The interests of pre- Socratic philosophers were centered on the world that surrounds man, the Cosmos. This was during the time of great internal and external disturbances in the Greek society, as it was right after the Peloponnesian war. The pre-Soc