Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 19

Sanskrit:

मय्याकाशात्मनि प्राणे मनसा घोषमुद्वहन् ।तत्रोपलब्धा भूतानां हंसो वाच: श‍ृणोत्यसौ ॥ १९ ॥

ITRANS:

mayy ākāśātmani prāṇemanasā ghoṣam udvahantatropalabdhā bhūtānāṁhaṁso vācaḥ śṛṇoty 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 prāṇa 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 Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, 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 Śrīmad-Bhāgavatam, Bhagavad-gītā and other such literatures. One who has properly understood the opulences of the Supreme Personality of Godhead finds all perfection, mystic and otherwise, in Kṛṣṇa consciousness.