Yajnavalkya
Yajnavalkya appears in the Brihadaranyaka Upanishad, one of the oldest and most philosophically dense Upanishads, as a sage about to renounce household life. Before he leaves, his wife Maitreyi asks whether wealth could make her immortal; he tells her it cannot, and what follows is one of the foundational texts of Vedantic philosophy — a teaching that the self (Atman) is not loved for anything else, but is the very thing for whose sake everything else is loved, and that it is ultimately identical with Brahman, the ground of all reality. His method of arriving at this — endlessly negating every description ("not this, not that") rather than positively defining the Self — became the template for centuries of Hindu apophatic theology and directly anticipates Shankara's Advaita Vedanta nearly 1,500 years later.
It is not for the love of the husband that the husband is dear, but for the love of the Self.
Neti, neti — "Not this, not that."