The Upaniṣads (lit. “sitting near [the teacher]“) are the concluding sections of the four Vedas and constitute the jñāna-kāṇḍa — the knowledge portion — of the Vedic corpus. Numbering traditionally as 108 (with ten principal ones), they explore the nature of Brahman, the individual self (jīva), and the material world, forming the bedrock of all Vedāntic philosophy.
In Viśiṣṭādvaita Vedānta, the Upaniṣads are the supreme pramāṇa (means of valid knowledge) alongside the Smṛti and Pañcarātra Āgamas. Rāmānuja's Śrī Bhāṣyam — a commentary on the Brahmasūtras — is entirely grounded in Upaniṣadic testimony. Key passages such as the Antaryāmi Brāhmaṇa of the Bṛhadāraṇyaka, the Udgītha of the Chāndogya, and the Nārāyaṇa Anuvāka of the Taittirīya establish Nārāyaṇa as both the material and efficient cause of the universe and as the inner self of all beings.
Yāmunāchārya's Āgama Prāmāṇyam demonstrated the consistency of the Pañcarātra revelation with the Upaniṣads. Rāmānuja synthesized these sources into a coherent vision where the Upaniṣadic Brahman is not a featureless absolute but a supremely personal Bhagavān endowed with infinite auspicious qualities, whose body comprises all conscious and inert reality.
[From alternate entry: upanishad]
Meaning of the Name
Upaniṣad is traditionally connected with receiving the highest knowledge by approaching and sitting near a teacher. The Upaniṣads are the Vedānta — both the concluding portions of the Vedic corpus and the culmination of Vedic teaching — and they expound Brahman, the self, bondage, meditation, and liberation.
Principal Upaniṣads
Traditional collections enumerate many Upaniṣads, and the number 108 is widely known. Rāmānuja did not leave separate extant bhāṣyas on a fixed list of individual Upaniṣads. Rather, he interprets Upaniṣadic passages extensively in the Vedārthasaṅgraha, Śrī Bhāṣya, and Gītā Bhāṣya. Later Śrī Vaiṣṇava authors, including Raṅgarāmānuja, composed individual Upaniṣad commentaries.
The ten works commonly called the Daśopaniṣads are Īśa, Kena, Kaṭha, Praśna, Muṇḍaka, Māṇḍūkya, Taittirīya, Aitareya, Chāndogya, and Bṛhadāraṇyaka. The Śvetāśvatara, Nārāyaṇa, Subāla, Mahānārāyaṇa, and other Upaniṣads are also important in the Viśiṣṭādvaita scriptural tradition.
Rāmānuja's Interpretation
Rāmānuja's Vedārthasaṅgraha gathers and reconciles major Upaniṣadic teachings, while the Śrī Bhāṣya establishes their coherent Vedāntic purport. Statements about the relation of ātman and Brahman are interpreted through the real and inseparable body–soul relationship: cit and acit exist as dependent modes or the body of Brahman, while Brahman remains their inner ruler and self. This is not an assertion that the individual soul and Bhagavān are absolutely identical.