" This transubstantiated body is also styled ativahika-deha or “superconductive body.” This omnipresent, luminous vehicle is endowed with the great paranormal powers (siddhi) acknowledged in all the scriptures of Yoga and Tantra. In the Yoga-Bîja, we find the following stanzas: The fire of Yoga gradually bakes the body composed of the seven constituents [such as bone, marrow, blood, etc.]. "

― Georg Feuerstein , The Yoga Tradition: Its History, Literature, Philosophy and Practice