Никифор Григора
Contemporary historians Emperor John VI Kantakouzenos and Nicephorus Gregoras deal very copiously with this subject, taking the Hesychast and Barlaamite sides respectively. The Orthodox perspective is one that states that there is scientific knowledge based on demonstration and spiritual knowledge based on demonstration. That the two understandings must remain separate in order to have a proper understanding of both in order to reject dualism. The Eastern approach to understanding God and spiritual matters as one that should not be approached with a Scholastic and or dialectical method (philosophy). Respected fathers of the church have held that these councils that agree that experiential prayer is Orthodox, refer to these as councils as Ecumenical Councils Eight and Nine.