I'm taking this Aquinas course through the religions department, which involves a lot of people trying to do philosophy without actually having any philosophical skill. It makes me feel quite important actually.
Anyways, someone raised the question the other day of why God can't sin, if he is omnipotent. Whilst I smoked my cigarette during the break, I flesched the question out (Call this the
Inconsistent Properties Argument):
1) If God exists, he has a conjunction of properties essentially, including (a) perfection, and (b) omnipotence.
2) If God is perfect, then he can't commit sin. (this is just the definition of perfection)
3) If God can't commit sin, then there's some act which he can't do.
4) If there's some act which God can't do, he's not omnipotent.
5) So if God's perfect, he's not omnipotent = God cannot be both perfect and omnipotent.
6) So God cannot exist. (5, 1)
Some scholar that someone read (I forget who) recommended denying (2). Here is his reason:
7) For any individual, if that individual is a moral agent, then it's possible for that moral agent to sin.
8) God is a moral agent.
9) So it's possible for God to sin.
I think the anti-2 argument is dumb, for a couple reasons.
1 - In metaphysics, the notion of 'can' is a notion about possibility. So a modal reading of (2) would yield: 'There is no possible world in which God commits sin'. This seems true. Denying (2), then, as this fellow wants to do, would yield something like - and this is just what (9) says: 'There is some possible world in which God sins.' Presumably the guy would take this line as follows: 'Look, it's true that God CAN or COULD sin. But in the actual world, he DOESN'T. And that's all that matters; that's all we're talking about.' So, we might think the anti-2 argument saves us from the Inconsistent Properties Argument because we don't say that God sins in the actual world. But then (in virtue of accepting the anti-2 argument) we're committed to saying God sins in some possible world, and that just seems wrong. Don't you think?* [NERD MORE: Furthermore, the (somewhat disputed) rule of modal logic S5 says: for any possibility, that possibility is necessary. So it's necessarily possible that God sins in some possible world. That's beginning to sound creepy at this point. It seems preferable to give up on the notion of God altogether.]
2 - Furthermore (and similarly to the first point), in metaphysics, most theories of personal identity are modally rigid: to have a property essentially just means you (or your counterpart) share that property across all possible worlds. If we accept that it's possible for God to sin in some worlds, as the anti-2 argument tells us, then we accept that the property of perfection is a non-essential property for God, and that seems equally wrong. (really, if this is the line the anti-2ist takes, she's actually an anti-1ist.)
3 - Finally, I'm not completely sure we should consider God to be a moral agent. If you accept that, say, x is right iff God does or recommends x, then anything God does just is a moral action, and he's not responsible to anyone for HIS moral actions. Since you need to be responsible to someone/something to be a moral agent, and since God isn't responsible to anyone/thing, he's not a moral agent. So I think the author, whoever this guy is, needs to give motivation for us to accept (8).
One thing the anti-2ist can say at this point is that we should say that God just doesn't have these properties essentially, and we shouldn't be relying so heavily on our intuitions. But it seems that, whatever God is, it just is part of the traditional definition of God that he has these properties essentially. If you're giving up on God's having these properties essentially, then you're giving up on the traditional sort of God anyways. And that might be fine for you, but the original idea here was to try to attack/save the traditional notion of God. The first argument, then, seems to have worked anyways.
The Inconsistent Properties argument never bothered me before (especially when you hear kids at the playground banter things like: "oh yeah tommy? well if God can do anything, why can't he SIN?!?!), but when you put properties and possible worlds into the mix it begins to look pretty foreboding. I'll be thinking about this one in the days to come.
*Furthermore, I think if we talk about omnipotence at least - maybe not perfection - we're almost talking about a modal property anyways: God CAN do anything. So the actual solution seems pretty impotent at this point. When the anti-2ist says, 'nonono, i just mean the actual world' it seems like what she really means is 'nonono, i've got this wussy notion about omnipotence that isn't like the omnipotence we usually take god to have (and isn't what YOU mean by omnipotence)'.