But WHY do we exist for Him? Why did He make us at all? It's not as if He can play us like marionettes for His amusement- we buck at Him and break His heart all too often to be very fun to have around. Like ants that bite the picnic-er (is that a word?).
The only thing I can think of is that He loves so much, He has to create things/beings to love. Even if they bite at Him often. A born dad has to grow up and have kids to feel complete.
-cel