The Philosophy of the Upanishads c6.s2.28

c6.s2.28

The commentaries, however, on the eleven Upanishads named are to be attributed in part probably not to S'ankara himself, but merely to his school, since the explanations given in the Upanishad commentaries often fail to agree with those in the commentary on the sûtras. The commentary on the Mâṇḍûkya which is extant under the name of S'ankara treats this and Gauḍapâda's Kârikâ as one, and seems to regard the whole as in no sense an Upanishad (p. 330: *vedânta-artha-sâra-saṅgraha-bhûtam idam prakaraṇa-c'atuṣṭayam* ‘*om iti etad aksharam*’ *ityâdi ârabhyate*); and with this would agree the fact that the Mâṇḍûkya is not quoted either in the Brahmasûtras or in S'ankara's commentary on them, while two verses from the Kârikâ of Gauḍapâda¹ are cited by S'ankara² with the words, *atra uktam vedânta-artha-sampradâyavidbhir âc'âryaiḥ*. In his commentary on the Brahmasûtras only the following fourteen Upanishads can be shown to have been quoted by S'ankara (the figures attached indicate the number of quotations),—Chândogya 809, Bṛihadâraṇyaka 565, Taittirîya 142, Muṇḍaka 129, Kâṭhaka 103, Kaushîtaki 88, S'vetas'vatara 53, Pras'na 38, Aitareya 22, Jâbâla 13, Mahânârâyaṇa 9, Îs'â 8, Paiṅgi 6, Kena 5.