SB 11.15.19
mayy akasatmani prane
manasa ghosam udvahan
tatropalabdha bhutanam
hamso vacah srnoty asau
Translation:
That purified living entity who fixes his mind on the extraordinary sound vibrations occurring within Me as the personified sky and total life air is then able to perceive within the sky the speaking of all living entities.
Purport:
Speech occurs by vibrating air within the sky. One who meditates on the Supreme Lord as the personified sky and air thereby acquires the ability to hear that which is vibrated at great distance. The word prana indicates that the Lord is the personified life air of the individual living entities and for the total aggregate of life forms. Ultimately, the pure devotees meditate on the supreme vibration — Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare — and are thus able to hear the speech originating from liberated living entities far beyond the material universe. Any living entity can hear such discussions by reading Srimad-Bhagavatam, Bhagavad-gita and other such literatures. One who has properly understood the opulences of the Supreme Personality of Godhead finds all perfection, mystic and otherwise, in Krsna consciousness.