I would offer that by "heart" we a referring to our narrative locus.
That
to "follow the heart" is to fulfill the needs of our internal narrative.
This is why the need of the "heart" are often in conflict with logic.
Logic seldom makes for a good story line.
As for spirit, hmmm... Maybe the personification of the narrative
locus.
(Let me think on that one some more.)
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Yes! Heart= internal narrative. I like!
Let us not forget that Spirit also refers to the part of us that
transcends need or desire (and ultimately, death). We as a species seem
to acknowledge that the needs of the heart are "worldly" and the spirit
is eternal or part of something outside of the "world".
-- Regards +------------------------------------------------------------------+ Ken Pantheists http://www.lurchinvault.com/ken Lurch In Vault Web Services http://www.lurchinvault.com +------------------------------------------------------------------+"If everything you know is wrong, then so are the scary parts, so relax." -Spider Robinson