An expression whose semantic contribution is exhausted by a context-to-referent rule cannot account for the irreducible first-person mode of presentation, so 'I' must have stable sense beyond mere indexicality.

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First-person(describing whose knowledge is being discussed): Knowledge or perspective from your own point of view, about your own mind or body, rather than about someone else.
Semantic contribution(describing what names contribute to language): The meaning or role a word plays in communication—what it adds to the overall meaning of a sentence.
context-to-referent rule(in philosophy of language): A rule that says the meaning of a word is determined solely by what it points to in a given situation (for example, 'here' means wherever you're standing right now).
indexicality(Proposed as an alternative explanation to lexical ambiguity for modals and anaphora.): A property of expressions whose reference or interpretation is determined by features of the context of utterance rather than by a fixed, stable meaning; contrasted with ambiguity.

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