The essence, significance and implied meaning of the word Sanai have been explained in this book in the light of the direct realization of Prajnanpurush Sri Sri Babathakur. This has been done from five different viewpoints ultimately leading to five Tattvas (essence), the names of which have evolved from the word Sanai – an Indian musical instrument. The Tattvas stem from the concept that this Sanai is the seeker and the realizer himself. Sri Sri Babathakur is thus this Sanai played by the Supreme Being. Sanai Tattva is basically a treatise on the idea of realization of the Supreme Being. The five Tattvas are presented in this book in five aspects, each covering a chapter and having the same essence i.e., Knowledge of Oneness.