Perhaps in order to answer the question, "What motivates god?" we need to consider the definition of 'motivate'.
-To provide with a motive - something (as a need or desire) that causes a person to act.
At this point, I want to make it clear that the answer is 'the experience of being all that is'. (Notice I didn't say "I think, or I believe" - this is the answer. :P
Now - to even ask this question supposes that god, has at some point 'acted'. Right? Otherwise, why ask. So...what has god done? What act has he commited? Creation? 'Making' us? Creating the universe? God is also supposed to be omnipresent, no? All there is, all there ever was, and all there ever will be, all at once. Right?
Then - how can we assume that he's ever lifted a finger? To do so supposes that at some POINT IN TIME (an illusion) something that exists "now" has not existed before - and because we can't conceive of how 'it' got here, then we attribute its creation to god. What an illusion...
NOTHING, let me say it again - NOTHING that exists right.....NOW, has NOT existed already. YET - with every passing moment, we CREATE a new moment. Notice how I had to rely on the illusion of time for that statement?
Thus - I state that even as I write this and you are reading this, it has already taken place. There IS NOTHING NEW...its the illusion of time that clouds our perception. For that reason, even the very answer I've given "to experience" becomes an illusion. Experience is merely remembering what you, I, god, and everything else - already is.
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Now is that deep or what?