I received an email with an interesting question:
The classical theistic tradition makes it well known that any knowledge of God’s essence is impossible, and even advances several argument as to why this is the case. However, if this is correct, I can’t really understand how the arguments from natural theology can give us any knowledge of his existence: isn’t the point of those arguments to show that God just is his existence itself, that is, that in God essence and existence are one and the same? Wouldn’t this mean that knowledge of his existence is also knowledge of his essence? And the latter being impossible, aren’t we left with a contradiction?
There are two answers to this. They depend on how one answers the question of whether we can predicate anything of God by analogy or whether we can only negatively predicate things of God.
I fall into the former camp and hold that one can predicate things of God by analogy. Thus when we say that God exists, we mean something which is analogous to our own existence but not something which is known in its entirety to us. To make a poor analogy but one that points in the right direction, when we say that a flower is white, we are describing an aspect of its color but we’re not saying anything about what it looks like in spectra that we can’t see. (It is the case that most white flowers look different in the UV spectrum which some insects can see.)
To say what God is, completely, is beyond our ability. But it is not accurate to say that we can’t know anything about God.
Part of why I fall into this camp is that it doesn’t make sense for creation to not even be like its creator; if we do not reflect any of God, then from where do we draw our qualities?
However, it is possible to go the other way and to say that we can only negatively predicate things of God. (These are not, in general, the people who do natural philosophy.) In which case, you get this result:
(“It is wrong to say that God exists. It is wrong to say that God does not exist. But it is more wrong to say that God does not exist. –Saint Dionysius the Areopagite)