Nadabindu Upanishad Verse 44

Sanskrit

विस्मृत्य विश्वमेकाग्रः कुत्रचिन्न हि धावति । मनोमत्तगजेन्द्रस्य विषयोद्यानचारिणः ॥ ४४॥

K. Narayanasvami Aiyar's Translation

The sound serves the purpose of a sharp goad to control the maddened elephant—citta which roves in the pleasure-garden of the sensual objects.

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Reference: Nadabindu Upanishad