The Vedanta Sutras of Badarayana: Third Adhyâya. Third Pâda.: III, 3, 6

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6. If it be said that (the udgîtha vidyâ of the Bri. Up. and that of the Khând. Up.) are separate on account (of the difference) of the texts; we deny this on the ground of their (essential) non-difference.

We read in the Vâgasaneyaka I, 3, 1, 'The Devas said, well, let us overcome the Asuras at the sacrifices by means of the Udgîtha. They said to speech: Do thou sing out for us.--Yes, said speech,' &c. The text thereupon relates how speech and the other prânas were pierced by the Asuras with evil, and therefore unable to effect what was expected from them, and how in the end recourse was had to the chief vital air, 'Then they said to the breath in the mouth: Do thou sing for us.--Yes, said the breath, and sang.'--A similar story is met with in the Khândogya I, 2. There we read at first that 'the devas took the udgîtha, thinking they would vanquish the Asuras with it;' the text then relates how the other prânas were pierced with evil and thus foiled by the Asuras, and how the Devas in the end had recourse to the chief vital air, 'Then comes this chief vital air; on that they meditated as udgîtha.'--As both these passages glorify the chief vital air, it follows that they both are injunctions of a meditation on the vital air. A doubt, however, arises whether the two vidyâs are separate vidyâs or one vidyâ only.

Here the pûrvapakshin maintains that for the reasons specified in the first adhikarana of the present pâda the two