Spiritual sound vibration purifies consciousness and connects the soul directly to Krishna through the heart's cleansed mirror.Listen — Srila Prabhupada Uvaca
Śrīmad-Bhāgavatam 3.26.47 — January 22, 1975, Bombay 750122SB-BOMBAY [39:28 Minutes] SB-03.26.47_750122SB-BOMBAY Nitāi: [leads chanting of verse, etc.] nabho-guṇa-viśeṣo 'rtho yasya tac chrotram ucyate vāyor guṇa-viśeṣo 'rtho yasya tat sparśanaṁ viduḥ [SB 3.26.47] [break] [01:19] "The sense whose object of perception is sound is called the auditory sense, and that whose object of perception is touch is called the tactile sense." Prabhupāda: nabho-guṇa-viśeṣo 'rtho yasya tac chrotram ucyate vāyor guṇa-viśeṣo 'rtho yasya tat sparśanaṁ viduḥ [SB 3.26.47] So ether, the sky, we cannot see, we cannot touch, we cannot smell—but we can hear the sound. As soon as there is sound, that, we know that there is ether, or sky. The sound vibration... As we have got experience of this material sound and therefore the material sky, similarly, there is spiritual sound and there is spiritual sky.
Without sky, there is no sound. So there is spiritual sky. We get information from śāstra: paravyoma. Vyoma is called sky, and there is another sky.
This is material sky, what we have experience. There is spiritual sky. And about that spiritual realization, as this creation begins from the sky—ether, then air, then fire, and then water, then land—kṣitir āp tejo marud vyoma—similarly, the spiritual world also begins from the spiritual sky. After this sky ends, there the spiritual sky begins. That is stated in the Śrīmad-Bhagavad-gītā, paras tasmāt tu bhāvaḥ anyaḥ [Bg. 8.20]: "There is another bhāva," means nature, "that is sanātana nature, eternal nature." This nature, this sky, is temporary.
It has got a duration of life, maybe millions and trillions of years, but it is not permanent. It is emanating from the Supreme Lord's breathing period. Yasyaika-niśvasita-kālam athāvalambya jīvanti loma-vilajā jagad-aṇḍa-nāthāḥ [Bs. 5.48]. So after this sky, there is another sky, and the sound produced from that sky is oṁkāra and Hare Kṛṣṇa mantra.
This is the sound vibration from the spiritual sky. Therefore it is effective immediately. Just like you contact thousands of miles away—somebody is speaking, and you can contact by the sound vibration you catch up with your machine, radio machine—similarly, the sound vibration from the spiritual sky you can also receive. That is Hare Kṛṣṇa mantra. Therefore Narottama dāsa Ṭhākura has described this Hare Kṛṣṇa mantra, "not of this material sky." Golokera prema-dhana, hari-nāma-saṅkīrtana.
Hari-nāma-saṅkīrtana, this is not a material sound. And in the Vedānta it is stated, śabdād anāvṛtti. By chanting the spiritual sound... The impersonalists, they chant oṁkāra: praṇavaḥ sarva-vedeṣu.
All Vedic mantras are preceded by the spiritual oṁkāra. That oṁkāra... Kṛṣṇa says, akṣarāṇām oṁkāro 'smi. Vedeṣu, praṇavaḥ sarva-vedeṣu, A, U, M, these are described in the Bhagavad-gītā.