The System of the Vedanta according to Badarayana's Brahma-Sutras and Cankara's Commentary c5.s3.t2.8

c5.s3.t2.8

Then follows, in the mouth of Raikva, the Samvargavidyâ, which has, however, not the slightest connection with the foregoing narrative, so that one could substitute for it, quite as suitably, almost any other extract from the Upanishad's. Also the systematising at the beginning, the legend of Kâpeya and Abhipratârin in the middle, with its Trishṭubh verses, and the promise "ya' evam veda" at the conclusion, go to show that here, as so often in the Upanishad's, we have to do with two quite independent passages, originally placed side by side only perhaps because the kṛita throw occurs in both, carelessly united by a later editor, and in later times (e. g. by Çañkara, p. 1006, 7) expressly maintained to be connected with each other.