The Doctrine of Divine Simplicity

Aquinas was ostensibly a sort of divine conceptualist. He followed Augustine in saying that the platonic ideas, or forms, are ideas in the mind of God. But then by means of his simplicity doctrine, he went even further by saying that the idea that there is a plurality of divine ideas is just our conception. We can't conceive of God's simple essence, and so we conceive of it as involving a plurality ofdivine ideas but in reality there is no such plurality. In that sense, Aquinas is a sort of anti-realist about abstract objects. It's trying to solve the obscure by postulating the more obscure, if you know what I mean.