Thomas Aquinas

=== God ===
[[Augustine of Hippo]]'s reflection on divine essentiality or [[essentialist]] theology would influence [[Richard of St. Victor]], [[Alexander of Hales]], and [[Bonaventure]]. By this method, the [[essence]] of God is defined by what God is, and also by describing what God is not ([[negative theology]]). Thomas took the text of [[Book of Exodus|Exodus]] beyond the explanation of essential theology. He bridged the gap of understanding between the being of essence and the being of existence. In [[Summa Theologica]], the way is prepared with the proofs for the existence of God. All that remained was to recognize the God of [[Book of Exodus|Exodus]] as having the nature of "Him Who is the supreme act of being". God is simple, there is no composition in God. In this regard, Thomas relied on [[Boethius]] who in turn followed the path of [[Platonism]], something Thomas usually avoided.<ref name="Gilson, Etienne 1994, pp. 84">Gilson, Etienne, ''The Christian Philosophy of St. Thomas Aquinas'', University of Notre Dame Press, 1994, pp.&nbsp;84–95</ref>

The conclusion was that the meaning of "I Am Who I Am" is not an enigma to be answered, but a statement of the essence of God. This is the discovery of Thomas: the essence of God is not described by negative analogy, but the "essence of God is to exist". This is the basis of "[[existential theology]]" and leads to what Gilson calls the first and only [[existential philosophy]]. In Latin, this is called "Haec Sublimis Veritas", "the sublime truth". The revealed essence of God is to exist, or in the words of Thomas, “I am the pure Act of Being”. This has been described as the key to understanding [[Thomism]]. Thomism has been described (as a philosophical movement), as either the emptiest or the fullest of philosophies.<ref name="Gilson, Etienne 1994, pp. 84" />