For myself I'm not a big fan of the Ainulindale, but I do like how Arda began with one word-"Ea."  I always preferred the stories of the Elves and the forefathers of Men.
I always thought that the story of Middle Earth and the beginning of Arda had religious undertones. Even though it has been said that Tolkien didn't intend for it to be.   
I always took the heart of the world to mean the center of the universe, the core of all things.  
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		| Oringinally Posted by Lalwendė: The Ainur are embodied in the physical aspects of this world, the elements and the weather;
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 Not unlike Old Man Winter, and Mother Nature?