Yogananda also stated that Krishna was referring to Kriya Yoga when "Krishna ... relates that it was he, in a former incarnation, who communicated the indestructible yoga to an ancient illuminato, Vivasvat, who gave it to Manu, the great legislator. He, in turn, instructed Ikshwaku, the father of India’s solar warrior dynasty." Yogananda stated that Patanjali wrote about the Kriya technique when he wrote: "Liberation can be attained by that pranayama which is accomplished by disjoining the course of inspiration and expiration." A direct disciple of Sri Yukteswar Giri, Sailendra Dasgupta (d. 1984) has written that, "Kriya entails several acts that have evidently been adapted from the Gita, the Yoga Sutras, Tantra shastras and from conceptions on the Yugas."