Three Notions of Resolutio and the Structure of Reasoning in Aquinas

THREE NOTIONS OF RESOLUTIO AND THE STRUCTURE OF REASONING IN AQUINAS 1 EILEEN c. SWEENEY Boston College Chestnut Hill, Massachusetts RESOLUTIO, better known by the English transliteration of its Greek counterpart, "analysis," has been touted as " the conceptual model for some of the most important ideas in the history of philosophy, including the history of the methodology and philosophy of science." 2 But while resolution /analysis may be important in the histories of philosophy and science, its own history is, to say the least, confused. A Renaissance commentator, Jeremias Triverius gives some sense of this when, after giving a list of four methods of dialectic (division , definition, demonstration, and resolution) ,3 he writes, 1 I have used the following abbreviations for works by Thomas Aquinas. All translations of Aquinas are my own. Commentum in Quatuor Libros Sententiarum (ed. Busa): In Sent; Compendium Theologiae (ed. Busa): Comp Theo!; E:rpositio Super Librum Boethii De Trinitate (ed. Decker): Exp de Trin; In Aristotelis Libros Posterium Analyticorum (ed. Marietti) : In Anal Post; In Duodecem Libros Metaphysicorum Aristotelis E:rpositio (ed. Marietti): In Meta; In Librum Beati Dionysii De Divinis Nominibus E:rpositio (ed. Marietti): In Div Nom; Sententia Libri Ethicorum Aristotelis ad Nichomachum: In Ethic; Sententia Libri Politicormn Aristotelis (ed. Leonine): In Pol; De Substantiis Separatis (ed. Busa): De Sub Sep; Summa Contra Gentiles (ed. Leonine): SCG; Summa Theologiae (ed. Leonine): ST; Questiones Disputatae de Veritate: QDV. 2 Jaakko Hintikka and Unto Remes, The Method of Analysis (Boston: D. Reidel, 1974), p. 1. s These four methods of dialectic are also given by a number of ancient commentators, for example, Ammonius (In Porphyrii Isagogen, in Commentaria in Aristotelem Graeca [hereafter, CAG], ed. Maximilian Wallies [Berlin , 1891], vol. IV, pt. 6, p. 34, 11. 19-20) and a later commentator, David (Davidis Prolegomena et in Porphyrii Isagogen Commentarium, CAG, ed. Adolf Busse [Berlin, 1904], vol. 18, p. 88, 11. 6-10). 197 198 EILEEN C. SWEENEY Now anyone who has some knowledge of dialectical matters knows what Definition, Division, and Demonstration are. There is no general agreement, however, so far as I can see, on Resolution. Some identify it with Division. Others regard it as contrary [to Divi- • ] 4 S!On , ••• Triverius, like many modern commentators, adds to, rather than sorts out, the confusion, continuing, " And since each one is entitled to his opinion, I am now maintaining that Resolution is contrary to Demonstration...." 5 Many centuries before Triverius we find a similar ambiguity in Greek commentators on Aristotle , who outline several types of analysis. Unlike Triverius, however, most seem untroubled by the multiple types; Ammonius and David, without puzzlement, explain carefully that analysis is the opposite of each of the other three methods.6 The lack of 4 Jeremias Triverius, In texnhn [sic] Galeni clarissimi commentarii (Lyon, 1547), p. 14; cited and translated in Nea! Gilbert, Renaissance Concepts of Method (New York: Columbia University Press, 1960), p. 106. Galen's opening remarks of the Ars medica, giving three methods of teaching (analysis, synthesis, and definition) is a common locus for the discussion of resolution/ analysis in the Middle Ages and Renaissance. Galen's contribution, at least for Aquinas, seems to have been completely mediated by Medieval Arabic commentators. Galen's own discussions are either incomplete, as in the opening passage to the Ars medica (in Claudii Galeni Opera Omnia, ed. C. G. Kiihn, [Repr. Hildesheim: Georg Olms, 1965], vol. I, pp. 305-306), which merely mentions the word, or are unclear accounts of analysis (Cf. Galen's discussion of analysis in De Peccatorum, in Opera Omnia, vol. 5, ch. 5, pp. 80-81). On two of the Arabic commentaries' descriptions of analysis to accompany medieval translations of Galen, see below, nn. 80 & 83. On Galen's supposed contribution to the notion of resolution and method in the development of experimental science, see A. C. Crombie, Robert Grosseteste and the Origins of Experimental Science (Oxford: Clarendon Press, 1953), especially pp. 7680 , and Gilbert, Renaissance Method, pp, 13-27, 44-46. 5 Triverius, In texnhn, p. 14; Gilbert, p. 106. 6 For analysis as the opposite of division, definition, and demonstration, see Ammonius, In Aristotelis Analyticorum Priorum Librum I Commentarium, CAG, ed. Maximilian Wallies, (Berlin, 1891...