There's a common misunderstanding of Thomas Aquinas. Due to the style of the Summa, the analytical prowess of Thomas' mind, and how we've characterized his arguments for the existence of God as "proofs," we tend to think we're in the land of logic rather than mysticism. But Thomas was most definitely a mystic. And few appreciate the apophatic nature of the Summa, especially when it comes to Thomas' arguments for the existence of God.
Let me explain.
When Thomas makes his arguments concerning the existence of God he is very clear in the Summa to make a distinction between God's existence and God's essence. People often miss this hugely important point. True, we might make an argument for God's existence, but that is a very thin claim. That God exists we might get our head around, but What God is and How God is, well, about such matters we have no clue.
Consider how Thomas ends each of his five arguments for the existence of God. He makes his argument--like how a infinite regress of causes is impossible thus demanding a "first" cause--and then states the conclusion this way: "This is what everyone names as God." For Thomas in these arguments the name "God" functions as a cipher, a word that points toward a mystery. We name the Source and Origin of the cosmos "God," but we really have no idea what we're talking about, what the word "God" actually names or means.
This is why it's a mistake to describe Thomas' arguments as "proofs for the existence of God." Thomas' arguments are better characterized as Signposts of Mystery. The human mind follows its innate metaphysical curiosity to the edge of the cosmos. And at that edge our minds stare into the Beyond. We know that the universe cannot be its own explanation. Why does it exist? How does it exist? We don't really know, but the word "God" points toward that Mystery. In this sense, even atheists agree with Thomas' arguments. All rational people know that a halo of Mystery encircles the material universe and fences in the human search for its Ultimate Source. And it's pretty well agreed, among both theists and atheists, that the word "God" has been historically used to point to such questions and mysteries. Whatever caused all this to come into existence, as Thomas says, "this is what everyone names as God," at least traditionally. And while today the word "God," as a metaphysical cipher, might be objected to, there should be no controversy that the Mystery the word "God" has traditionally pointed toward hasn't gone anywhere.
Basically, the ontological questions that "God" names? These remain.
When the debates about God get into the cosmos the winner of those debates ends up being the one who is the smartest or knows the most about the scientific. I’m neither of those so I steer away from them. My “coming to Jesus” wasn’t about that anyways, it was about what He had done inside my mind & heart. I can not relate to all persons on an intellectual level nor is that the best place for us all to meet. Where we all can agree is on the emotional, motivational, instinctual level, in other words on the heart. God made us that way. He lives in our hearts therefore that’s where He desires us to meet others at. Not on national, race, intellect, financial status levels, at the level of the heart.
All humans feel some variation of the same emotions, experience hurt in the same root ways. Fear is fear, love is love, higher purpose is higher purpose across all nationalities, all religions, both sexes. This is because God put His seed inside each & every person, we are after all made in His image. Atheists, agnostics & believers alike have in common a striving for a better, they all respect (or fear) the judgement that better makes on them (this is the fear of the Lord). When times are tough they all hope or pray upward, to something better than who they’ve proven to be. When we have even a brief moment of honest humility we realize that to be better we must aim at what is greater than we are wherever or whoever we think that is. That is a universal human trait. That is the proof of God.
Jordan Peterson masterfully unwraps this from the psychological perspective in his lecture series called Maps of Meaning. It’s available on his YouTube channel & very helpful in helping me understand this better.
https://youtube.com/playlist?list=PL22J3VaeABQCn5nTAx65NRlh1EsKD0UQD&si=wZ9o6b5u_uKf8y_9
"We know that the universe cannot be its own explanation." Well stated. I'll be using that statement. Love it.