Brhadaranyaka Upanisada

The Bṛhadāraṇyaka Upanishad is contained within the Shatapatha Brahmana. It is widely known for its philosophical statements, and is ascribed to Yajnavalkya. Its name means "great-wilderness-Upaniṣad".  It includes three sections, namely, Madhu Kanda, Muni Kanda (or Yajnavalkya Kanda) and Khila Kanda. The Madhu Kanda explains the teachings of the basic identity of the individual or Atman. Muni Kanda includes the conversations between the sage Yajnavalkya and one of his wives, Maitreyi. Various methods of meditation and some secret rites are dealt in the Khila Kanda. The doctrine of "neti neti" (later on understood as "neither this, nor that") and a often quoted verse, "Asato Maa" is found in this Upanishad.