This isn't strictly theology-related, but I think it could be useful. Compare moral realism (the viewpoint that moral properties are 'real') and moral anti-realism (the viewpoint that moral properties are not real, at least outside of subjective judgement). If we assume that anti-realism is true, than no moral state exists in the universe. But if we assume the opposite, that moral properties are true and objective, than a moral state does exist. Now since the existence of a moral state is more moral than the nonexistence of such, it follows that moral properties can be objectively real. Thus, moral realism is true by definition.
Do you think this works? Could it be seen as analogous to the Ontological argument?
I'm afraid it doesn't seem to me to work. Let me try to set out the argument as I understand it more structurally:
(1) If anti-realism is true, no moral state exists.
(2) If realism is true, a moral state exists.
(3) It is more moral for a moral state to exist than for one not to exist.
(4) So the truth of realism would be more moral than the truth of non-realism (from 1, 2, and 3).
(5) Therefore realism is true.
I don't see how you get from (4) to (5). The only way to do it, as far as I can tell, would be to have an additional premise along the lines of:
(4') The most moral situation is the true one.
If you add that premise in, then the argument is valid, but the problem now is that (4') seems entirely unsupported, not to mention implausible.
So I don't see how your conclusion can plausibly follow from your premises.
In addition to this, premise (3) seems very questionable to me. I don't see why the existence of a moral state should necessarily be more moral than the non-existence of one. I'd have thought that it would be better to have no moral state at all than a very immoral one, for example. And a non-realist would probably hold that the notion of "moral states" beyond subjective opinions is meaningless anyway, in which case your use of this language reflects realist assumptions to start with.
The difference between Chalcedonian christianity and Monophysitism seems difficult to comprehend. Even if there is something very subtle I am missing between the two doctrines, this goes beyond splitting hairs. Why did these people view each other as heretics?
As Tigranes says, they're pretty relaxed about it all now. But the difference between the two was perfectly clear at the time. Chalcedonians believed that Christ had two natures, and Monophysites that he had only one. This wasn't just hair-splitting, though it may seem like it at first glance given that they all accepted the same basic understanding of the incarnation, i.e. that Christ consisted of two basic "bits", the divine Son (his divine nature) and a human bit which was united to it. The dispute was over the status of that human bit - whether it counted as a "nature" or not. The Monophysites thought that "nature" meant a really existent thing, in which case to say that Christ's human bit was a "nature" was to say that it was a thing in its own right alongside the divine nature. This would mean that Christ was really a partnership of two things rather than a genuine unity. And that would in turn mean that humanity and divinity were not really united in him. The Chalcedonians, on the other hand, thought that if Christ's human bit wasn't a human nature then he wasn't really human at all. This would again have the consequence that humanity and divinity were not really united in him.
The vital thing to understand is that this cut to the very heart of Orthodox Christianity. The central idea is that, in the incarnation, humanity is united to divinity, and this makes it possible for human beings in general to unite to God and ultimately become divine themselves. That's what salvation consists of. So any theology that denies the true union of divinity and humanity in the incarnation undermines the basis of Christianity, at least on this understanding of it. That is why people took these disagreements so seriously, and I'd say that, given the presuppositions with which they were working, they were right to do so.