Yesterday was my last class session for Humanities 3: Philosophy and Theology. Our final reading included Locke’s variation (from the Essay) on the proof of the existence of God, which has naturally been a recurring theme in the course. He emphasizes throughout that God must be an intellectual being, because it’s inconceivable that matter could produce intellect — and an intuition struck me: is there a proof of the existence of God that doesn’t rely in some way upon mind-body dualism?
I threw the question out to both sections, and some interesting conclusions emerged. First, in none of the other proofs we discussed — Anselm, Aquinas, Descartes — was mind-body dualism so obviously crucial as in Locke’s. Yet it does seem that belief in some kind of spiritual reality is necessary for infinite-regress-prevention proofs (like some of Aquinas’s Five Ways) to be proving God rather than, for example, the Big Bang. The end of all his proofs is “And this, everyone agrees, is God” — but it’s ultimately mind-body dualism that makes it seem intuitively obvious that the first cause or prime mover can’t be material.
Second, and more essentially, it seems that all the classical proofs depend more broadly on ontological hierarchy, of which mind-body dualism is a decisive piece. God can be purely spiritual and yet produce matter because the spiritual is above the material and can therefore produce it, while the opposite could never be the case. And while Anselm’s proof may seem immune to this, he isn’t sheerly trying to prove the “existence” of that-than-which-no-greater-can-be-thought — he’s trying to prove that that thing is God, in the familiar and traditional sense. The definition isn’t just a clever move to be able to deduce existence, but to be able to simultaneously deduce everything else we know about God — and that depends on an ontological hierarchy providing “objective” standards for what’s greater.
This reliance on mind-body dualism and ontological hierarchy, more than any logical missteps in the proofs, may account for why they are so unconvincing to most people today.