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.
Six pupils come to Pippalāda and each receives one answer to his own question: where beings come from, who is chief among the powers of the body, what happens in sleep, what contemplation of the syllable Oṃ gives, and where the one with sixteen parts lives.