The synagogue of Satan is the assembly of false, adversarial thoughts within a person, the impulses that claim a spiritual name and standing they do not possess, saying they are of the higher line yet living from the lower nature. To be a Jew inwardly is to belong genuinely to the awakened, praising self, and those who only say it and are not are the pretending faculties that mask the carnal mind in holy dress. The promise is that these false powers will be brought down to bow at the feet, the lowest and most grounded part of the standing self, forced to acknowledge the awareness that truly holds the light. What happens in a person is the subduing of the lying inner voices until they submit to the genuine center they once impersonated.
Synagogue of Satan: the inward assembly of false, adversarial thoughts, the gathered impulses that claim a spiritual standing they do not have.
Feet: the lowest, most grounded part of the standing self, the base to which the false powers are brought down to bow.