Nitāi: "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, then the spiritual sky begins.