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.
Fifteen verses in which Skanda says to his father: "the heart of Śiva is Viṣṇu, the heart of Viṣṇu is Śiva." A short answer to every quarrel of names, ending with the Ṛgveda's verse on the supreme step of Viṣṇu.