For that matter, I would see no reason why other beings could not
know them either. To go to an extreme hypothesis, I don't see any obvious
inconsistency in supposing that in heaven we shall each know everything and
hence be omniscient, since omniscience does not seem to imply omnipotence.
(I'm not saying that I think it is plausible that we shall know everything
there, but just that I see no obvious inconsistency in this hypothesis.)
Now I might be overlooking some Godelian self-reference
inconsistency in assuming a knowledge of everything, but I don't know enough
about these subtleties to know that there is such an inconsistency. If
there is, it is not obvious to me that it might not imply that even God
cannot possibly know everything, but I have never heard any claimed proof to
this effect. Has anyone?