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Prasthanatrayi (Sanskrit: प्रस्थानत्रयी, IAST: Prasthānatrayī), literally, three sources (or axioms), refers to the three canonical texts of theology having epistemic authority, especially of the Vedanta schools. It consists of:
- The Upanishads, known as Upadesha prasthana (injunctive texts), and the Śruti prasthāna (the starting point or axiom of revelation), especially the Principal Upanishads.
- The Brahma Sutras, known as Sutra prasthana or Nyaya prasthana or Yukti prasthana (logical text or axiom of logic)
- The Bhagavad Gita, known as Sadhana prasthana (practical text), and the Smriti prasthāna (the starting point or axiom of remembered tradition)
The Upanishads consist of ten, twelve or thirteen major texts, with a total of 108 texts (some scholars list ten as principal – the Mukhya Upanishads, while most consider twelve or thirteen as principal, most important Upanishads). The ten Upanishads are Īśā, Kena, Kaṭha, Praṣna, Muṇḍaka, Māṇḍūkya, Taittirīya, Aitareya, Chāndogya and Bṛhadāraṇyaka.
The Brahma Sūtras (also known as the Vedānta Sūtras), systematize the doctrines taught in the Upanishads and the Gītā.
Founders of the major schools of Vedanta, Adi Shankara, Madhvācharya wrote bhāṣyas (commentaries) on these texts. Rāmānujāchārya did not write any bhāṣya (commentary) on the Upanishads, but Ramanuja wrote bhāṣyas (commentaries) on Brahma Sutras and Bhagavad Gita. Even though Ramanuja did not write individual commentaries on Principal Upanishads, he quoted many hundreds of quotations from Upanishads in his Sri Bhasya. In the Ramanuja lineage, one of his followers, Rangaramanuja, wrote commentaries on almost all of the Principal Upanishads around the 1600s. Vallabhacharya and Nimbarkacharya wrote bhāṣyas (commentaries) on Brahma Sutras and Bhagavad Gita but they did not write commentaries on Upanishads but they quoted many verses from Upanishads in their works.
- Hindu philosophy
- Mukhya Upanishads
- Bhagavad Gītā
- Śāstra pramāṇam in Hinduism
- Veda Vyas
- Brahma Sūtras
- Vallabhacharyaji Mahaprabhu
- Vepa, Kosla. The Dhaarmik Traditions. Indic Studies Foundation.
- Original Upanishads spanned beyond 108 texts. However, only 108 texts remained during the oral transmission process across generations.
- Robert C Neville (2000), Ultimate Realities, SUNY Press, ISBN 978-0791447765, page 319
- Stephen Phillips (2009), Yoga, Karma, and Rebirth: A Brief History and Philosophy, Columbia University Press, ISBN 978-0231144858, pages 28-29
- Peter Heehs (2002), Indian Religions, New York University Press, ISBN 978-0814736500, pages 60-88
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