The Mukhya Upaniṣads

Kena · Khaṇḍa 1 · The Light Behind Mind and Senses

Mantra 8

यच्छ्रोत्रेण न शृणोति येन श्रोत्रमिदं श्रुतम् ।तदेव ब्रह्म त्वं विद्धि नेदं यदिदमुपासते ॥ ८ ॥

In plain words

That which hearing does not hear, but by which this hearing is heard—know That alone as Brahman, not this limited object that people worship.