Sacred Texts: The Classics

The Enneads of Plotinus: THE SIXTH ENNEAD: THIRD TRACTATE...

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This is a piece of Neoplatonic metaphysical philosophy, almost certainly from Plotinus's *Enneads*, engaging critically with Aristotelian categories of substance. The passage investigates what unifies Matter, Form, and the Composite ("Couplement") as the three primary candidates for Substance, testing each proposed definition in turn. It first rejects "serving as a substrate/base" as the defining criterion, since this would disqualify Form from being a Substance entirely. It then examines the criterion of non-predication — the idea that Substance is whatever is never predicated of something else — finding it more promising: fire, wood, and individual persons like Socrates are never predicated of anything external, whereas qualities like whiteness or relations like fatherhood always presuppose a distinct subject. The most distinctive move comes in the treatment of the Matter-Form relationship: Plotinus resists saying Form simply "resides in" Matter as in a substrate, arguing instead that Form is the completion that Matter's nature as pure potentiality demands, making the two co-constituents of a third thing rather than one being a modification of the other. The passage concludes with a positive definition of Substance as that which belongs essentially to itself and from which all other things derive their existence — the "centre of passivity and source of action" — a formulation that points toward Plotinus's broader project of grounding all reality in a hierarchy of self-subsistent principles.

The Enneads of Plotinus: THE SIXTH ENNEAD: THIRD TRACTATE...

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