John Duns Scotus · Theology
Scotus’s subtlest tool - the <em>distinctio formalis a parte rei</em>, a distinction in the thing itself that is less than a real distinction between separable things, yet more than a merely mental one - used to hold together divine simplicity and real attributes, the soul and its powers, and nature and haecceity.
Before Scotus, the schoolmen mostly worked with two kinds of distinction. A real distinction holds between things that are genuinely separable, or at least could exist apart - your hand and your foot, the matter and the form of a statue, two different substances. A distinction of reason (a conceptual or mental distinction) holds only in the mind’s way of considering one and the same thing - as when we distinguish ‘the morning star’ from ‘the evening star,’ though both are Venus, or think of a single point as both the end of one line and the start of another. The first is a difference in reality; the second is a difference in thought only. But Scotus found cases that fit neither box - places where a merely mental distinction seemed too weak, yet a real distinction seemed too strong. To handle them he forged a third, intermediate tool: the formal distinction on the side of the thing (distinctio formalis a parte rei).
The engine of the idea is the notion of a formality (formalitas): a real, definable aspect or ‘formal content’ of a thing, corresponding to what a true definition would capture. Two formalities are formally distinct when neither is included in the definition of the other - when the account of the one does not contain the account of the other - even though both belong to a single, indivisible reality. Take a stock example: in a single individual, its animality and its rationality. These are really one (there is one man, not an animal plus a reason stuck together), and inseparable in him; yet ‘animal’ does not mean ‘rational,’ and the two formal contents are not identical - the difference is in the thing, not merely in our labels. That is a formal distinction. Scotus’s claim is that reality has this fine structure: single things can contain a plurality of really-identical but formally-distinct aspects, and a careful metaphysics must register it. To ignore it, he thought, is to be forced into false choices - either denying real differences that are plainly there, or shattering unities that are plainly one.
The formal distinction is not a one-off patch but a load-bearing beam that runs through Scotus’s whole system. He deploys it wherever he needs unity and real difference together. In God: between the divine attributes (wisdom, goodness, will), and between the divine essence and the three persons of the Trinity - really one essence, formally distinct relations, so the Trinity is neither three gods nor a mere play of names. In the soul: between the powers (intellect and will) and the soul’s essence - one soul, formally distinct faculties, so the will is not a separate thing from the mind yet is genuinely not the same power. In the individual (from the previous lesson): between the common nature and the haecceity - really one Socrates, formally distinct humanity and thisness. Everywhere the pattern is the same: a single reality with a fine internal articulation that is neither the crude plurality of separable parts nor the weightless plurality of mere concepts. This recurring subtlety is exactly what earned Scotus his title, the Subtle Doctor.
This is the opening of the lesson. The rest — the dialogue, the primary source, and the recall — is in the app.
You learned that Scotus introduced a third kind of distinction between the real (separable things) and the conceptual (mind-made): the formal distinction a parte rei , which holds between formally different but really identical and inseparable aspects of one thing. Explain how it works and why he needed it for the div…
Leads to William of Ockham.
Begin this lesson →epoché — a humanities education that remembers you.