This Critical Introduction that Saivism and Tantra have their origin in the Vedas from where they derive their source and elaborate on them in detail whether it be consciousness. Grades of consciousness, cakras, kundalini, nadis, aesthestics, reconciliation between the vital and the spiritual as is proposed in Chapter 29 of Tantraloka, yoga, etc. lie embedded in the Vedas. Abhinavagupta in his Tantraloka, III.226 refers of Aitareya where its author Mahidhara Aitareya has been identified as a manifest form of Siva an as such is said to have taken the world as a form of visarga (:) remission (Aitareya Aranyaka III.8). This Introduction removes the cloud of misconception/cobweb that has gathered in the form exclusivity. Sectarian attitude leading to mathika system and ignorance which is inherent in human nature. If human beings overcome this tendency of exclusivity then only the Reality shines forth otherwise they get stuck and are bereft of experiencing the true nature of Reality.