42 Deleuze’s Philosophical Lineage
12. Thomas Aquinas, Summa Theologiae: A Concise Translation, edited by
Timothy McDermot (Westminster, MD: Christian Classics, 1989), p.
32.
13. Aquinas, Summa Theologiae, p. 18.
14. Thomas Aquinas, Selected Philosophical Writings, trans. Timothy
McDermott (Oxford: Oxford University Press, 1993), p. 225.
15. Duns Scotus in R. Prentice, The Basic Quidditative Metaphysics of Duns
Scotus as Seen in His De Primo Principio (Rome: Antonianum, 1970),
p. 54. Returning to the set theory reference made earlier, one could say
that in Duns Scotus’ reading of Aristotle, being is not a set of all sets but
it is rather a proper class – that is, a group of sets that, without being a
set, can still be defi ned by some property that all its members share.
16. John Duns Scotus, Philosophical Writings, trans. Allan Wolter
(Indianapolis and Cambridge: Hackett Publishing Company, 1987), p.
4.
17. Duns Scotus, Philosophical Writings, p. 4.
18. Duns Scotus, Philosophical Writings, p. 20. Duns Scotus’ particular
strategies for establishing this limited human knowledge are not rel-
evant for this chapter. Suffi ce it to say here that certain strategies availa-
ble through the naturally hierarchical analogical conception of being are
unavailable to him. Rather than suggesting a route to the divine through
the proportion between fi nite and infi nite beings and their attributes,
Duns Scotus instead relies on the idea of an essentially ordered series
of causes, where effects always refer to causes of a higher order and
ultimately to a fi rst cause that transcends the entire causal series. For
discussion, see Widder, Genealogies of Difference, pp. 128–34.
19. Duns Scotus, Philosophical Writings, p. 3.
20. Duns Scotus, Philosophical Writings, p. 2.
21. In order to strengthen the link between Duns Scotus and Spinoza,
Deleuze attempts to characterise Duns Scotus’ notion of formal distinc-
tion as a precursor to Spinoza’s idea of a non-numerical real distinction
between attributes (see, in particular, EPS 63–6). To that end, Deleuze
holds that formal distinction is a real but not a numerical distinction
and that it is a distinction between quiddities: ‘Between animal and
rational there is not merely a distinction of reason, like that between
homo and humanitas; . . . Formal distinction is defi nitely a real distinc-
tion, expressing as it does the different layers of reality that form or
constitute a being. Thus it is called formalis a parte rei or actualis ex
natura rei. But it is a minimally real distinction because the two really
distinct quiddities are coordinate, together making a single being. Real
and yet not numerical, such is the status of formal distinction’ (EPS
64; see also DR 39–40). However, this reading is problematic in two
respects. First, Duns Scotus famously defi nes formal distinction as being
weaker than the real distinction between real beings but stronger than