Siva is considered to be the Adhi Yogi, First Yogi. He gave the world Vaasi Yoga. Vaasi Yoga is different from The Asthtanga Yoga of Patanjali in that while Vaasi Yoga directly reaches out to Consciousness, Asthtanga Yoga reaches out to Consciousness through the Modifications of Chitta. That is the cessation of thought processes.
Reality is Immanent in the Universe.It is within Us too.What is in the Macrocosm is in the Microcosm.The Reality appears to be different from us, away from us, is because of our ignorance, Avidya at the individual level and Maya at the Universal Level.Once this ignorance is removed, Reality ,Brahman shines forth just as our image becomes brighter in a Mirror which was dusty earlier.Bhogar says that though you may be aware that the Reality,Universal Soul, Brahman and You as Individual Souls are not different, he tells us to forget
Matra is the time for taken for one involuntary wink.Tamil language is designed on Matra. Each letter of Tamil is assigned the time, Matra. For Instance A,அ is one Matra, Kuril,குறில்.) Aa ஆ has two Matras.The pronounciation of Siva Siva is assigned Four Matras. So for Puraka one has to chant mentally Siva Siva four times: Kumbhaka Siva Siva sixteen times
This was the first system by Lord Shiva and His disciple Patanjali developed a relatively easy system Asthtanga Yoga.
Shiva was the first to practice Vaasi Yoga and He is called the Adi Yogi the First Yogi.
The term Sachidanda is used for Only Shiva.
And Consciousness is elevated to Realization by Vaasi Yoga.
I am providing some basic details of Vassi Yoga.
Do Not Attempt to Practice without Initiation from a Guru.
Practicing without initiation by a Guru may prove to be serious and at times Fatal.