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Thus does Knasas follow Aquinas' course of reason from that which is essentially I esse i -neutral to an essentially pure and simple subsistent I esse i (pp. 59-63). Knasas aptly recognizes this operation as "the mental furnace" of "metaphysical ideas", for it is only thus that one is able to reason to the aforementioned fantastical or spiritual essences, and judge whether their I esse i or non- I esse i is knowable (p. 102). John F. X. Knasas is currently the most important proponent, in the lineage of Joseph Owens and Étienne Gilson, of what is called "Existential Thomism" or "Thomistic Existentialism", directed by interpretation of the centrality of the notion of being ( I esse i ) in Thomas Aquinas' metaphysics (pp. 2-3). [Extracted from the article]