Just another idea borrowed from the Zoroastrians, via the Greeks. There is precious little in jesusism that is original.
http://en.wikipedia.org/wiki/Fravashi
http://en.wikipedia.org/wiki/Fravashi
Quote:A fravashi /frəˈvɑːʃi/ (Avestan fravaši; Middle Persian fravard, fravahr, fravash, fravaksh) is the guardian spirit mentioned in the Avesta of an individual, who sends out the urvan (often translated as 'soul') into the material world to fight the battle of good versus evil.