The Kena Upaniṣad, from the Sāma Veda, explores the source of consciousness and asks: “By whom is the mind directed, and who impels the senses to act?” It teaches that behind all thought, perception, and life is the supreme reality, Brahman, which cannot be grasped by the mind or senses but is their very basis. By realizing this subtle truth, one moves beyond ignorance and attains immortality.