Shankara himself, and his grand-teacher Gaudapada, were influenced by Buddhism. Gaudapda took over the Buddhist doctrines that ultimate reality is pure consciousness ("vijñapti-mātra") and "that the nature of the world is the four-cornered negation". Gaudapada "wove doctrines into a philosophy of the "Mandukya Upanishad", which was further developed by Shankara". Gaudapada also took over the Buddhist concept of "ajāta" from Nagarjuna's Madhyamaka philosophy. Shankara succeeded in reading Gaudapada's "mayavada" into Badarayana's "Brahma Sutras", "and give it a "locus classicus"", against the realistic strain of the "Brahma Sutras".