Chapter 5 Aquinasâ Tertia Via: Sources, Structure, and Logic
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Modern discussions of Aquinasâ âTertia Viaâ argument for the existence of God (Summa theologiae, I, q. 2, art. 3, corpus) have focused on three issues: (1) the possible sources of the argument, (2) its structure, and (3) its place within Aquinasâ broader metaphysical and physical commitments as a scholastic Aristotelian. The paper argues, on structural, textual, and conceptual grounds, for one of the earliest modern interpretations of the Tertia Via, according to which one of its main sources is indeed the âThird Argumentâ from Part II of Maimonidesâ Guide of the Perplexed. This interpretation assumes that Aquinas is positing, for the purposes of this argument, an eternal world, and that his use of the terms quandoque and aliquando refer to the relative future rather than the relative past or to metaphysical dependency relations. Follows a defense of the apparent âquantifier shiftâ in the first step of the argument: given a few reasonable assumptions about the conceptual structure of the argument, Aquinas can be acquitted of the charge of formal fallacy.