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 the renounced — the paramahaṃsas, who have neither staff, nor marks, nor dwelling. The book sharply separates renunciation as a status from renunciation as a state, and says only the second has worth.