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 one beyond the fourth" — the rarest of people, who has stepped off every ladder and lives like a child or a madman. The book warns at once: this is a description, not a model to imitate.