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Full Idea
One thing simpliciter is produced out of many actually existing things only if there is something uniting and tying them to each other. If Socrates were animal and rational by different forms, then to be united they would need something to make them one.
Gist of Idea
One thing needs a single thing to unite it; if there were two forms, something must unite them
Source
Thomas Aquinas (Quaestiones de anima [1269], 11c), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 25.2
Book Ref
Pasnau,Robert: 'Metaphysical Themes 1274-1671' [OUP 2011], p.578
A Reaction
This is the reply to the idea that a single thing is just an interesting of many sortal essences. It presumes, of course, that a thing like a horse has something called 'unity'.
| 16109 | Things are a unity because there is no clash between potential matter and actual shape/form [Aristotle] |
| 16088 | Aristotle's solution to the problem of unity is that form is an active cause or potentiality or nature [Aristotle, by Gill,ML] |
| 16104 | Unity of the form is just unity of the definition [Aristotle] |
| 13277 | The 'form' is the recipe for building wholes of a particular kind [Aristotle, by Koslicki] |
| 16766 | One thing needs a single thing to unite it; if there were two forms, something must unite them [Aquinas] |
| 16765 | Humans only have a single substantial form, which contains the others and acts for them [Aquinas] |
| 16614 | Matter and form give true unity; subject and accident is just unity 'per accidens' [Duns Scotus] |
| 16780 | Partial forms of leaf and fruit are united in the whole form of the tree [Suárez] |
| 16758 | The best support for substantial forms is the co-ordinated unity of a natural being [Suárez] |
| 12700 | Form or soul gives unity and duration; matter gives multiplicity and change [Leibniz] |
| 16748 | Aquinas says a substance has one form; Scotists say it has many forms [Pasnau] |