In developing his theory of aether in De Caelo 1, Aristotle argues, in DC 1.4, that one circular motion cannot be contrary to another. In this paper, I discuss how Aristotle can maintain this position and accept the existence of celestial spheres that rotate in contrary directions, as he does in his revision of the Eudoxan theory in Metaphysics 12.8.

The paper corrects misrepresentations of Aquinas's understanding of divine simplicity, argues that the reasons he gives for divine simplicity are persuasive ones, and suggests how Aquinas's account of the Trinity can be used to explain how God can be said to exist necessarily. It gives an account of Aquinas's conception of form and individualised form, and shows how Plantinga's criticism of Aquinas's position on divine simplicity rests on a misunderstanding of Aquinas's notion of form. It describes and makes the case (...) for Aquinas's argument that God must be absolutely simply because he is the uncaused cause of all effects, and any real composition in things constitutes an effect. It shows that Brian Davies is mistaken in claiming that Aquinas does not hold God's existence to be logically necessary. It applies Frege's conception of existence to Aquinas's account of God's simplicity and his psychological analogy for the Trinity, in order to explain how God's existence can coherently be said to be logically necessary. (shrink)

[I] Divine Simplicity: God and His Existence Types of Divine Simplicity Of the properties ascribed to God in Aquinas' natural theology, we may call one sort ...

The problem of evil -- Aquinas, philosophy, and theology -- What there is -- Goodness and badness -- God the creator -- God's perfection and goodness -- The creator and evil -- Providence and grace -- The trinity and Christ -- Aquinas on god and evil.

Contemporary thinkers who address the problem of causal relations generally favor Hume’s analysis, although some periodically manifest interest in Aristotle’s exposition as an important and viable alternative. Few, however, find among the many philosophers who came between Aristotle and Hume any worthwhile contributor to the development of this problematic. Some might note, for example, Nicholas of Autrecourt as a medieval precursor of Hume, but this merely keeps the discussion fluctuating between the same two poles. This essay aims to call attention (...) to a different and intermediate view, not hitherto noted, that was proposed in the High Middle Ages by Thomas Aquinas. It argues that Aquinas made a significant advance beyond Aristotle in his analysis of antecedent causation, and thereby made possible the certification of some elements in Hume’s analysis, without subscribing to its more extreme results. In so doing, moreover, Aquinas adumbrated some problems in contemporary analytic discussions of the causal relationships between events, and consequently may shed light on their solution. (shrink)