मान्त्रवर्णिकमेव च गीयते ॥ १५ ॥
māntravarṇikameva ca gīyate || 15 ||
māntravarṇikam—That which has been referred to in the Mantra portion; eva—the very same; ca—moreover; gīyate—is sung.
15. Moreover that very Brahman which has been referred to in the Mantra portion is sung (in this Brahmana passage as the tail).
The second chapter of the Taittiriya Upanishad begins, “He who knows Brahman attains the Highest . . . Brahman is Truth, Knowledge and Infinity.” This very Brahman is finally declared to be the tail. Otherwise there would be a contradiction between the Mantra and Brahmana portions, which cannot be, for the Brahamanas only explain what the Mantras declare. Therefore Brahman is the primary subject-matter and is not treated as a part of “the self consisting of bliss”.