Essentialism

Aristotle's essentialism grows out of his account of substance and definition: to define a thing properly, he argued, is to state its essence, the properties without which it would not be the kind of thing it is, as opposed to its accidental properties, which it can gain or lose while remaining the same kind of thing throughout, a human being's rational capacity being essential on Aristotle's own famous example, while a particular human's height or hair color remains merely accidental. This distinction was meant to make science possible in a principled way: knowledge of a kind of thing, for Aristotle, is knowledge of its essential properties and what follows necessarily from them, not a mere catalogue of whatever happens to be true of instances one has observed, which could shift arbitrarily from case to case with no underlying pattern to explain or predict anything.

The view faces persistent difficulties even on its own terms: borderline cases, a fetus, a corpse, a person with severe dementia, put pressure on any claim to have identified a clean, non-arbitrary boundary marking exactly which properties are essential and which merely accidental, and evolutionary biology's picture of species as gradually changing populations rather than fixed kinds has made essentialism about biological species specifically far harder to defend than it was in Aristotle's own static cosmos.

Essentialism underwrites a great deal of religious anthropology directly: doctrines holding that human beings possess a fixed nature made in the image of God, that a particular deity has an essential nature shared identically across multiple persons, or that a soul retains its essential character across successive lives all depend on essentialism being true in at least some restricted domain, even where the wider metaphysical debate is never explicitly raised.

Nagarjuna's Madhyamaka Buddhism poses the position's sharpest rival, since sunyata denies precisely what essentialism affirms, that anything, including a person, possesses a fixed, independent, defining nature at all, treating even apparently stable kinds as dependently arising and therefore empty rather than essentially anything.

Nominalism presses a different, Western objection, denying not that things have stable natures in some loose sense but that general kinds themselves, humanity, redness, triangularity, are anything over and above the individual things we group under those labels using a shared name, a dispute that runs directly into the medieval problem of universals this atlas tracks under its own heading. Essentialism found an influential modern proponent well outside religion: Saul Kripke's 1970 lectures, published in 1980 as Naming and Necessity, revived the idea that objects and natural kinds have essential properties fixed by their origin or underlying structure, a technical philosophical argument that reopened serious debate on a question theology, in its own idiom, had never stopped asking.