To Nous and "Epinoia" correspond Heaven and Earth, in the list given by Simon of the six material counterparts of his six emanations. The identity of this list with the six material objects alleged by Herodotus to be worshipped by the Persians, together with the supreme place given by Simon to Fire as the primordial power, leads us to look to Iran for the origin of these systems in one aspect. In another, they connect themselves with the teaching of Pythagoras and of Plato.