St thomas aquinas on being and essence
On Being and Essence by Thomas AquinasA small error at the outset can lead to great errors in the final conclusions, as the Philosopher says in I De Caelo et Mundo cap. 5 (271b8-13), and thus, since being and essence are the things first conceived of by the intellect, as Avicenna says in Metaphysicae I, cap. 6, in order to avoid errors arising from ignorance about these two things, we should resolve the difficulties surrounding them by explaining what the terms being and essence each signify and by showing how each may be found in various things and how each is related to the logical intentions of genus, species, and difference.
Since we ought to acquire knowledge of simple things from composite ones and come to know the prior from the posterior, in instructing beginners we should begin with what is easier, and so we shall begin with the signification of being and proceed from there to the signification of essence.
On Being and Essence
Metaphysics is taken by Thomas Aquinas to be the study of being qua being, that is, a study of the most fundamental aspects of being that constitute a being and without which it could not be. If an essence has an act of being, the act of being is limited by that essence whose act it is. A material substance say, a cat or a tree is a composite of matter and form, and it is this composite of matter and form that is primarily said to exist. The details of this very rich metaphysical landscape are described below. Saint Thomas, that is, Aquinas, clarifies the nature of metaphysics through ascertaining its particular subject-matter, its field of investigation.
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Thomas Aquinas, was a Dominican monk, who generally one of the greatest Scholastic writers of all times. He used ancient philosophy to prove religious propositions. One of the ancient philosophers that St. Thomas Aquinas used to prove religious facts was Aristotle. One of the greatest works that Aristotle did was to prove that god really exists.