The Upaniṣads — the philosophical core of the Vedic tradition, revealing the nature of Brahman, the Ātman, knowledge, action and liberation. The ten principal Upaniṣads together with select minor Vaiṣṇava Upaniṣads.
On the highest rank of wanderers: no marks, no dwelling, no name; all that remains is the syllable Oṃ and work with it. It begins the same way as the Turīyātīta: Brahmā questions the Primordial Nārāyaṇa.