Vajra recitation involves a process where the innate tones of the incoming and outgoing breaths traveling through the central channel are identified with mantra syllables.
The function or actual purpose o f vajra recitation
The Great Commentary, on verse 116 of the Methods of Accomplishment chapter, says:
“In the pränäyäma meditations also the two pathways,” referring to the left and right pathway, “collapse,” meaning are blocked, and winds enter the central pathway.
Similarly the Cakrasamvara Commentary says:
Pränäyäma means blocking the left and right paths of lalanä
and rasanä so that the winds are constantly in the avadhütï.
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