Sri Tamaraiselvan Ramaiya Aiya explains the prominent role of Va Si or breath as revealed by Agathiyar in his "Anandha Perukku".
Man goes through misery at times and joy at other times. But both this extreme states do not provide a conducive environment for one to think about Erai and experience him. Control of the breath removes both misery and overindulgence in material joy, bringing one to a state of oneness and calm. This is possible with the aid of a Siddha Guru. Taking Agathiyar as a Guru will bring us to this state of union and merging with Erai. The numerous stanzas of praise for Agathiyar by other Siddhas help us to get to know him better.