Heaven Was Not Empty
"When we say that God became man, we do not mean to say that heaven was empty. That would be to think of heaven as a kind of space, like a room that was twenty by thirty feet. When God came to this world, he did not leave heaven empty. When he came to this world, he was not shaved down, whittled down to human proportions. Rather, Christ was the life of God dwelling in human flesh. St. Thomas Aquinas includes a very beautiful description of this in one of his hymns. He said, 'The heavenly word proceeding forth, yet leaving not the Father's side'."