Nadabindu Upanishad Verse Unknown

Sanskrit

When the (spiritual) sight becomes fixed without any object to be seen, when the vāyu (prāṇa) becomes still without any effort, and when the citta becomes firm without any support, he becomes of the form of the internal sound of Brahma-Praṇava.

K. Narayanasvami Aiyar's Translation

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Reference: Nadabindu Upanishad