In the Vedas it is said, antar bahiś ca tat sarvaṁ vyāya Narayana sthitaḥ: "Narayana is all-pervading, and He exists both within and without." Antar meaning within. There are many things which are beyond the perception of our imperfect senses, yet the authoritative evidence of sound vibration is perfect. The Vedas are known as śabda-brahma because evidence taken from the Vedas constitutes the ultimate understanding. This is because śabda-brahma, or the Vedas, represents the Supreme Personality of Godhead. However, the real essence of śabda-brahma is the chanting of the Hare Kṛiṣhṇa mantra. By vibrating this transcendental sound, the meaning of everything, both material and spiritual, is revealed. The meaning of everything is received through the air through sound vibration. The vibration may be material or spiritual, but without sound vibration no one can understand the meaning of anything. (Vaniquotes)