The last time I checked, most of the time people don’t agree on what constitutes a great person or a great machine or a great novel. The meaning of “greatness” is clearly subject to one’s own opinions. And something is perfect if it lacks flaws. What constitutes a flaw is also a matter of debate, and therefore perfection is also debatable. This should be obvious to anyone who’s ever had contact with other people at all.
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You actually left out one relevant part of my previous post when you where quoting replies and didn’t seem to me to respond, so I’ll bring it up again, since I think it illustrates what I mean here. I’m glad you are interested in the idea of Greatest Conceivable Being theology (GCB) though. One doesn’t have to be to be a Christian, but I find it useful myself, though it can be subject to misunderstanding.
For instance, you are suggesting, as skeptics sometimes do, that “great” is a sufficiently vague term as to not be helpful here. But that strikes me as mistaken. For instance, if I refer to a great dinner, or the greatest comedian I have every heard, or a great man, I think you would get the sense of what I mean. You would know that by “great” I mean a dinner, or comedian, or man, of surpassing excellence. You wouldn’t think that I was saying “good grief, that was a terrible dinner/person.” So I think you know perfectly well what “great” means, or at least well enough for our purposes.
Now here is where the challenge comes in. God is by definition a GCB (at least I would say so). By this, I mean that God is a being of surpassing excellence, such that no being with greater excellence can possibly be thought of (if it could, then that being would be God). This is the concept of God, what “God” means. Now we may disagree on some of the traits that a GCB would have. For instance, you might think it greater to be timeless, while I might think it greater to be temporal, but that is ok. We agree the
concept of GCB is clear. We know that when I call God a GCB, I am not saying that He is the worst, most disgusting being one can imagine. Next, we probably can agree on many traits that a GCB would have. For instance, I think it reasonable to say that a GCB would be morally perfect, omnipotent, omniscient, and metaphysically necessary. We may not agree on the precise understanding of omniscience, (does God know the future? have middle knowledge? propositional knowledge? a simple direct perception of reality?) But we agree that omniscience means to know everything and that a being that knows only and all truths is greater than a being that does not. Hence as a GCB, God knows only and all truths.
Now, the point here, is that God is the paradigm of moral goodness. God is a GCB, and as being that is the paradigm, the very standard, of moral goodness is greater than a being that merely exemplifies it (you seem to imply by your first post that you would agree with this). Hence, God is different from human persons, since human persons are not GCBs and not the paradigm’s of moral goodness; God, however, as a GCB (which humans are not) is the paradigm of moral goodness.
So, back to my comparison above. God is to goodness as salt is to saltiness. Just as salt is the paradigm by which we measure saltiness, so God is the paradigm by which we measure goodness.
1). - Hence I say: why is that pizza salty? You reply: because it tastes like salt. I ask: why is salt salty? you reply: salt is the very paradigm of saltiness. I say: why? you say: “it just is, sooner or later you need to reach some stopping point, you can’t keep asking “why” forever.”
2). Hence you say: why is an action or being good? I reply: An action or being is more good in so far as it approaches the character of God, a GCB, and the paradigm of moral goodness.
you say: Why is God good? I could reply: “he just is, the same way salt is salty.” I could add that it is the very nature of God to be good.
Now consider where too much skepticism on this point would lead you.
In the same way, you ask “why is God good?” I could ask, "why is the good good? Why is that good? why is that good?
ad infinitum.
As I say above:
We have two choices, 1. either we decide that “good” is completely without meaning. This seems to me to entail various absurd consequences. (For example, if “good” is meaningless, then we cannot say that a man who sacrifices is life for a friend is more good than a man who rapes and kills little children-- not only is this irrational, but it is frankly offensive).
2). Alternately, we agree that in terms of what is “good” we have to reach some stopping point sooner or later. The nature of God, a GCB, is thus the least arbitrary stopping point. As a greatest conceivable being (which I would say God is by definition), God is good by nature. A being that is the paradigm of moral goodness is greater than a being that merely exemplifies it. Thus God’s nature is definitive or moral goodness.
As for God changing, there are different views on the subject. Some Christians follow Aquinas in saying the God is pure act, completely simple, and does not change at all. Others would distinguish between intrinsic and extrinsic change. God does not change intrinsically, but he may change extrinsically, in relation to other things. He can change in this respect, but not in his own nature.