Bṛhadāraṇyaka-Upanisad [sanskr. u. engl., Ausz.] - Chāndogya - Upanisad [sanskr. u. engl., Ausz.] "Ignorance" and "supreme truth" according to Saṅkara's commentaries on the Bḥadâranya-Upaniṣad and Chândogya-Upaniṣad (1981)