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True Nature of Nāda
The very nāda (ādi shabda', the primordial word or sound) that emanated from God in the beginning of the Creation has been called the 'shabda brahma' (word god). The Amritanāda Upanishad says of this primordial word or quintessential sound:
"The Primeval Sound cannot be pronounced for it is devoid of vowels & consonants, and cannot be uttered with any of the places of pronunciation in the body such as throat, palate, lips, nose, tongue, teeth etc; that sound does never decay, is ever undiminished."
That primal sound echoes all the time in all the bodies, as our most adorable Gurudev, Maharshi Mehi Paramhans, says,
"Meditate, O Brother, upon the Lord's immortal name. That true sound reverberates in bodies, one & all."
The words we speak, depending upon the point within the body these originate from, are classified as 'parā vānī' (the sound emanating from the navel), 'pashyanti vānī' (that originating in the heart), 'madhyamā vānī' (word with its source in the throat) and 'baikharī vānī' (sound produced in the mouth). In a verse of his, our Gurudev (Maharshi Mehi Paramhans ) says that that quintessential or primal sound is distinct from these four. The gist of the poem goes like this:
"The quintessential sound is neither parā, nor pashyanti, nor madhyamā, nor baikhari (the four sounds explained above) It is different from all alphabetical as well as āhat' (produced due to mutual collision or striking of two objects) sounds. That is 'anähat' or unstruck melody. The perceiver of this primal word gains access into the "Sachkhand' (Realm of Pure Consciousness or Primeval Sound) and does not have to come again into this mortal world. When single-pointedness has been achieved by diligent practice of drishti yoga learnt from an accomplished Guru, a large variety of sounds are heard within. However, it calls for intent, concentrated listening practice keeping eyes, ears and mouth all shut. One sound (that is) heard leads unto another sound which, in turn, takes ahead to yet another sound. Thus getting hold of several sounds, one after another, one finally gets hold of the most captivating Quintessential Primordial Sound... And, as even this Unstruck Melody is transcended, the Highest State, the Nameless or the Soundless State (Pure or True State of God) is attained."
Gurudev (Maharshi Mehi Paramhans) has clarified it further in Part IV of his book 'Satsanga Yoga':
"Pure Consciousness and the Primal Sound emanating from its centre (God Himself) can be said to be nirguna' beyond, or without the three attributes or qualities namely, 'sat', 'raj and
tam') and 'nirākāra' (formless or shapeless). This Primordial Sound was definitely produced before both the Conscious as well as the Non-conscious prakritis (creations) were