Edited sentence: "  This bodily position and the practice of rhythmatically breathing while  invoking a divine name seems to be common to both Jewish Merkabah mysticism and Christian Hesychasm.According to some of the adepts of the Jewish Merkabah mystical tradition, if one wished to "descend to the Merkabah" one had to adopt the prayer posture taken by the Prophet Elijah in I Kings 18:42, namely to pray with one's head between one's knees.Alan Segal in his book Paul the Convert suggests that the Apostle Paul may have been an early adept of Merkabah mysticism in which case what was novel to Paul's experience of divine light on the road to Damascus was not the experience of divine light itself, but that the source of this divine light identified himself as the Jesus whose followers Paul was persecuting.Daniel Boyarin notes that Paul's own account of this experience would therefore be the earliest first person account of the mystical vision of a Merkabah adept.This is the same prayer posture used by the Christian Hesychists and is the reason that they were mocked by their opponents as "navel gazers.Thus the practice may have origins in the ascetical practices of the biblical prophets