The Bṛhadāraṇyaka Upaniṣad asks, “By what can one know the Knower?” Modern neuroscience and philosophy of mind echo the same puzzle in the “hard problem of consciousness.” Instruments and theories can track brain states and behavior, but never Awareness itself—the very light by which all knowing occurs. Advaita Vedānta makes the radical move: the Knower is not an object of study but the Self, svayam-prakāśa, self-luminous. To seek it as an object is like the eye trying to see itself. Liberation lies in abiding as That, not in endless inquiry.