Maybeso, fellows.
I picked up "entheos" from a review of the book Entheos: the God Within by Rene Dubos. An excerpt is below...

... entheos, a Greek term meaning 'god within,' from which our familiar word enthusiasm comes. He states it is this that drives man on into ever new ventures and greater creativity. Yet it would be better to say that it is not only enthusiasm in the ordinary sense, but also inspiration, for both are expressions of entheos, the god within. This suggests the kind of enthusiasm that Plato might have had in mind when he said the power of the poet to move the souls of men came through an ecstasy or 'divine mania' resulting from an overshadowing or 'possession' by the god Apollo, symbol of the Logos or universal mind.

This point of view opens up a larger vista of what is implied by the Greek term entheos, encompassing much more than the peculiarities of a personality that lasts only one lifetime. Dubos expounds it 'scientifically,' as the manifestation of what we inherit genetically and distill from our experience. He says that our ideals and what we commit ourselves to, flow from or are the expression of this entheos, thus accounting for the kinds of thoughts which emerge from us, and what we do.