Nadabindu Upanishad Verse 49

Sanskrit

सशब्दश्चाक्षरे क्षीणे निःशब्दं परमं पदम् । सदा नादानुसन्धानात्संक्षीणा वासना भवेत् ॥ ४९॥

K. Narayanasvami Aiyar's Translation

This sound is absorbed in the Akṣara (indestructible) and the soundless state is the supreme seat. Karmic affinities are destroyed by the constant concentration upon nāda.

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Reference: Nadabindu Upanishad