From the MP:
Patrick Grim gives something like the following argument. What I know when I know that
1. I am making a mess
is an indexical fact that no one else can know. At most, what someone else can know is that
2. BV is making a mess
or perhaps, pointing to BV, that
3. He is making a mess.
I remember Craig giving an analogous argument, which generalizes to any subjective experience. Nagel’s bat shows that any sensory apparatus has a subjective fingerprint that no outsider can be aware of. But it is either obvious or silly (but which?) to say that God doesn’t know what an itch feels like, and that he is in the same position as we are when we try to imagine what it’s like for a beetle to relish manure.*
The argument has a lot of logical possibilities. There is something incommunicable about the subjective, to be sure, and we need to preserve that. Raising the question of God presses the problem of individuality and existence, which Reichmann showed was the fundamental opposition between Thomas and Scotus. One suspects the problem goes all the way up to the question of the individuality and existence questions of the Trinity, and that this awaits a further development.
*My suspicion is that black widow or praying mantis males would be very offended if their spouse didn’t eat them.