Maitreya Rudrabhayananda said this quote
“ When the power of breath (Sa) is controlled it becomes rested (as) and in thatstate it transforms into protector(tra); this is the basic principle of life andconsciousness, wherein the senses, mind, intelligence all are protected anddirected through the power of breath in a rested state, this is called Sa+as+tra (SASTRA). It is the most powerful weapon alive and the most powerfulprotector as well. One who stills, directs, controls and allows it to rise fromthe core of the body to the subtle, subtler, subtlest levels of consciousness isconsidered to be well versed in Sastras. Ananth Yoga allows one to work onthe Grossest, Gross, Subtle, Subtler levels of consciousness, through thebreath power leading on to connect to the subtlest level of consciousness. ”