Christine Korsgaard's self-constitution thesis presupposes a unified self that persists across actions, but Parfitian reductionism denies any such metaphysically robust self to be constituted.

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Christine Korsgaard(the author being discussed): A contemporary American philosopher known for her work on ethics, identity, and what makes actions right or wrong based on rational principles.
Derek Parfit(as a philosopher being cited for his theory on personal identity): A highly influential philosopher who argued that personal identity (what makes you 'you' over time) is less important than we think, and that we're not the unified, continuous selves we assume we are.
Parfitian reductionism(as an opposing view to Korsgaard's theory): A theory named after philosopher Derek Parfit that claims the self is not a single, deep thing but rather just a collection of interconnected experiences, memories, and relationships.
Persists across actions(as describing how a unified self remains stable): Continues to exist and remain fundamentally the same even as you perform different actions over time.

Based on where you are in your exploration

Presupposes(as describing what Plantinga's argument takes for granted)

Assumes something to be true without proving it—like how an argument might presuppose that logic works, without first arguing that logic is valid.

Reductionism(The second dogma identified in Quine's "Two Dogmas of Empiricism" (1953, 20))

The belief that each meaningful statement is equivalent to some construct upon terms which refer to immediate experience.

Self-constitution thesis(as Korsgaard's central philosophical claim)

The idea that you create and define who you are through your actions and the commitments you make, rather than being born with a fixed identity.

Unified self(the main subject being discussed)

The everyday sense that you are a single, consistent 'I' that experiences the world as one coherent perspective, rather than fragmented pieces.

metaphysically robust(as used in metaphysics)

Reflecting something real and fundamental about how the world actually is, not just a trick of language or notation.

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