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itinerant1
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The problem as Aquinas addresses it deals with the nature of our knowledge. To know what God is, or, to put it in other terms, to know the meaning of the word “God”, is not to know automatically, or without further ado, that God exists. To move from an understanding of the meaning of the word “God” to affirming His existence as self-evident, is to make an illicit transition from the conceptual to the existential order. More on this below.I think St. Thomas would disagree. Any who truly knows what God is would know that He necessarily exists. Indeed, God and the blessed both have certain knowledge of this. St. Thomas says that “God exists” is evident in-itself. You discuss this below.
This ignores, as did Anselm, how our knowledge of God is actually acquired. Biographically, in regard to St. Anselm, who grew up always knowing that God existed, he found it difficult to understand how anyone could not know He exists. I have a similar difficulty trying to understand the atheistic mindset.The problem is that this begs the question against St. Anselm and other defenders of the ontological argument. St. Anselm, no fool, would have probably responded that God’s existence is self-evident to the learned. Indeed, if I were St. Anselm this is the very tack I would take. Isn’t this the essence of Anselm’s discussion of the problem of the “fool” who “has said in his heart that there is no God?” Namely, that he has a merely verbal and not truly mental conception of what God is. In other words, if he were more learned about what he was speaking about, that he would see God’s existence as self-evident.
My foregoing comment about how we come to know the existence of God will be continued below.
“Being that than which no greater can be conceived” is a descriptive definition. The observation that it lacks a genus and specific difference is irrelevant because God is not in a genus, as He is Being itself, or Existence itself. Nothing greater than Being itself can be conceived and that is what or who God is: “I Am” as He told Moses.St. Thomas is right, of course, that we do not know the essence of God. Nevertheless, Anselm’s argument does not require that we know the essence of God but only that we pick out some object by a definite description (to adopt a more modern terminology-- we pick out some object such that it is the “being that than which no greater can be conceived”-- and if you pay close attention this is not a definition, as it lacks any sort of genus or specific difference). For that reason, it also avoids St. Thomas’s charge that we cannot use an ontological argument because we don’t know God’s essence (although if you check my earlier critique, there is a sense in which God’s essence becomes a stumbling block to the argument).
The argument Aquinas presents is that we cannot start with either the idea of God or a definition of God and immediately conclude that God exists. (We could immediately and licitly conclude that God exists if the proposition were truly self-evident.)
If we possessed an intuition (direct knowledge) of the divine essence then God’s existence would be self-evident because His essence and existence are one. However, since we do not possess in this life an intuition of the divine essence the proposition that “God exists” is not self-evident or analytical to the human mind.
The reason Aquinas will not allow for the existence of God to be self-evident is grounded in his understanding of human knowledge. All of our knowledge begins with sense experience. From the particulars of sense data the intellect abstracts the universal element and knows a thing by means of the universal concept.
Accordingly, we reason from our knowledge of created beings, and any knowledge of being that transcends the natural order is attained by reflection on the data of the senses. In regard to this natural knowledge, it is through the mind’s understanding of created things that we come to knowledge of the Creator, as St. Paul says, “Ever since the creation of the world, the invisible existence of God and his everlasting power have been clearly seen by the mind’s understanding of created things.”
It is through this process of reflection, when carried out systematically, that constitutes the proof of the proposition “God exists.” Hence, our knowledge of God’s existence is not self-evident.