All the living beings are chanting the natural mantra. Manthra is defective by a pause in between the lines. Therefore chanting would not provide 'laya'.
The Sadhaka while continuing chanting Manthra would fix his mind on pranava nadam, while merging the mind, Manthra with prana. When the Mind, Prana and Nada unite the 'Sadhaka' becomes a layayogi. In layayoga, prana becomes motionless and the sadhaka feel a peculiar bliss.
When the prana and apana unite in the sushumna Naadi, the sadhaka becomes hathayogi. Hathayogi becomes free from all the illness.
When sakthi beeja is awakened that unites with the shivabeeja in the Sahsradalapdama, the Sadhaka becomes Rajayogi.
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