Katha Upanishad Verse 2.1.3

The Atman is the ultimate ground of all experience. It is through the Self alone that one is able to perceive form, taste, smell, sound, touch, and pleasure. Nothing exists beyond this subtle perceiver.

Sanskrit Verse

येन रूपं रसं गन्धं शब्दान्स्पर्शाँश्च मैथुनान् ।
एतेनैव विजानाति किमत्र परिशिष्यते । एतद्वैतत् ॥ ३ ॥

Transliteration

yena rūpaṃ rasaṃ gandhaṃ śabdānsparśām̐śca maithunān |
etenaiva vijānāti kimatra pariśiṣyate | etadvaitat || 3 ||

Translation

By which alone, one knows form, taste, smell, sounds, touch and the pleasures of the sexes; what remains here unknown to that. This verily is that.

Related: Indriya