They kind of ended up that way.
Still, the quiet theme of Heaven and Earth and the spiritual essence of both, tying the two existences together is a thread I purposely twined throughout the books.
You can't have angels without Heaven.
Nor hell without devils.
Speaking of devils...it's been pretty fun writing them, I have to admit. I adore my black spirits, their sinewy, translucent black emptiness is wonderfully creepy.
Who knew bad could be so much fun to write?