- Interiority(Distinguished from externally observable properties; the basis for personhood)
- The condition of conscious self-presence that constitutes the inner life of the human person
- Levinas(the statement refers to his philosophical position)
- Emmanuel Levinas was a 20th-century philosopher who argued that other people are fundamentally mysterious and unknowable to us—their inner thoughts and feelings can't be fully captured or understood through our normal ways of communicating.
- Opacity(describes how a person's inner world remains mysterious)
- Being unclear, hidden, or impossible to see through—the quality of being mysterious or not fully understandable.
- Semiotic systems(describes how we normally try to understand each other)
- Systems of signs and symbols we use to communicate and share meaning—like language, gestures, or written words.
- The Other(Central to Russell's ethic of impersonal self-enlargement)
- Everything beyond the individual self: other selves, the non-human universe of large impersonal forces (wind, sea, mountains, stars), and potentially the entities of mathematics.
- The trace(what we use to try to understand others, but which fails to capture their full reality)
- In Levinas's philosophy, the small signs or evidence we can observe about another person (like their words or actions), which we mistakenly think let us fully understand them.
- alterity(Levinas' counter to Heidegger's claim that being addresses us through language)
- Otherness that inhabits the self and constitutes the sensuous conditions of possibility for speech; distinct from Heideggerian being
- irreducible(Personalist anthropology; distinguishes personhood from mere biological individuality)
- That which is unique and unrepeatable in each human being, by virtue of which a person is not merely an individual of a species but a personal subject.