Suppose there are possible worlds in which God exists but Anselm
does
not. Then (I argue) there are possible worlds in which Anselm does not
exist, but
God cannot even entertain the thought that he does not. In such worlds
Anselm does
not exist, but God does not know that. This, I argue, is incompatible with
(a
straightforward construal of) the doctrine of God's essential omniscience.
Considerations
involving negative existentials also call into question a certain picture
of
creation, on which God chooses which particular (possible) individuals
to create.
They suggest that there is an element of brute contingency about which
individuals
exist.
Mediaeval philosophical theologians held – so far as I know without
exception –
that God was essentially omniscient. In what follows, I shall argue
that the existence of individuals whose non-existence is compossible with
God's existence raises serious difficulties for the doctrine of God's
essential
omniscience. If there are individuals that might not have existed even
though
God did, then – I shall try to show – questions arise about
whether God
would have been omniscient, if He had existed, but they hadn't.