A buddy of mine and I began to discuss St. Thomas Aquinas, and as we talked about him, I mentioned that Aqiunas’s work on the Blessed Trinity was profound for me and helped me so much, especially in the Person distinction and in the Eternal Generation of the Son and the Spiration of the Holy Spirit. After I had sad this, my friend said he doesn’t agree with Eternal Generation/Spiration. After questioning, he thinks that language of generation implies that there is a change in God, and doesn’t escape Arianism. He thinks that “Eternal Generation” is an incoherent term. He said, " You can’t have eternal and speak of something being prior. Prior by definition is temporal. If we hold to Aquinas, we can’t speak of Change in God because of simplicity. Generation/Procession are active terms and are in reference to change using Aquinas own argument. If we speak of change we speak of time." He went on to explain that the terms generation and procession are only in reference to the Economic Trinity but not the Ontological Trinity.
So my response was to try and emphasis the Eternity of God, and that He exists outside of time, therefore cannot change, and so terms like generation and procession have different meanings in God. That the Spirit can Proceed out of the Father and the Son eternally and there be no change since God exists in eternity and eternity being wholeness with no beginning or end as Aquinas states.
We decided to talk more later via phone call, we were only texting at this time, but I thought I’d ask real quick on here to get any thoughts or points that I could raise. I am reading Aquinas Summa on procession and some other works by theologians, but wanted to ask here as well.