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Surat Šabada Yoga (Yoga of Divine Sound)
In the Yoga of Sound (Surat Shabda Yoga), the gross material sound (anhad sound) manifests initially, and thereafter the essential inner divine sound (anahad), also know as OM or Pranava. It is the cosmic sound of the beginning.
There are several references to the essential cosmic sound in the context of Lord Mahavira's teachings:
Taking hold of this essential anahat element (the sound of OM) or Shivanam, the ascetics have gone across [beyond] this world of delusion and pain.
In this way meditation upon the mantra and the essential sound are described. Also the technique of meditation on the OM sound is elaborated:
O Ascetic! Meditate on the cosmic sound of OM because it is like rain for extinguishing the fire of suffering. And it is also like a lamp which illuminates the subtle essence of the sacred teachings. It is the governance of good deeds. (Jnanarnva, sarga: 38)
Acharya Tulsi says:
From the infinitesimal point and the divine sound the subtlest waves (vibrations) reverberate.
In his book, The Method of Using Preksha Dhyāna, Acharya Mahapragya writes:
Close both ears with your hands and listen to the inner sounds.
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