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The Principal Upanishads, also known as the Mukhya Upanishads, are the oldest and philosophically most influential texts of the larger Upanishad canon in Hinduism. The Upanishads consist of the concluding portion of the Vedas, referred to as Vedanta ("end of the Vedas"). There are hundreds of texts that claim the title Upanishad, however, classical scholarship prioritize a subset of ten (and sometimes thirteen) primary texts.
Commentaries (bhashyas) composed on the Principal Upanishads, along with the Bhagavad Gita and Brahma Sutra, are universally accepted to establish classical Indian philosophies. The Principal Upanishads are geared towards internal contemplation versus external rituals, which aid in the formulation of philosophies regarding the ultimate reality (Brahman), the self (atman), morality (karma), rebirth, and ultimate liberation (moksha).
The Upanishads are a vast collection of Sanskrit texts and consist of the concluding portions of the Vedas, the most ancient scriptures of Hinduism. The Upanishads are also referred to as Vedanta, which translates to "the end of the Vedas." Over time, hundreds of texts claimed the title Upanishad, however, tradition dictates a small group of Principal Upanishads, or Mukhya Upanishads. These select Upanishads are consistently regarded as evolving from the Vedas and accepted across all major schools of Indian philosophy. The Principal Upanishads are separated into three categories: early prose, verse, and late prose.
The Sanskrit adjective mukhya means "principal" or "chief". The scholar William Mahony defines the major Upanishads as those that most classical Indian philosophers interpreted and that nearly all Indian commentators regarded as connected to the Vedas. The term is a matter of tradition and scholarly convention rather than a single fixed list, and the number counted as "principal" varies between sources .
The Principal Upanishads are linked to individually linked to a specific Veda and within the context of its specific recension. Each is traditionally linked to one of the four Vedas and to a particular branch (śākhā) of Vedic learning.
| Upanishad | Sanskrit (IAST) | Associated Veda | Form |
|---|---|---|---|
| Isha | Īśā | Shukla Yajurveda | Verse |
| Kena | Kena | Samaveda | Verse and prose |
| Katha | Kaṭha | Krishna Yajurveda | Verse |
| Prashna | Praśna | Atharvaveda | Prose |
| Mundaka | Muṇḍaka | Atharvaveda | Verse |
| Mandukya | Māṇḍūkya | Atharvaveda | Prose |
| Taittiriya | Taittirīya | Krishna Yajurveda | Prose |
| Aitareya | Aitareya | Rigveda | Prose |
| Chandogya | Chāndogya | Samaveda | Prose |
| Brihadaranyaka | Bṛhadāraṇyaka | Shukla Yajurveda | Prose |
Scholars writing in the nineteenth and twentieth centuries often extended the list to thirteen by adding theŚvetāśvatara (Shwetashvatara) Kauṣītaki (Kaushitaki) and Maitrāyaṇīya (Maitrayaniya). Robert Ernest Hume's 1921 translation helped fix this thirteen-text set in English-language scholarship. The Muktikā canon of 108 Upanishads, a later Indian list, places the principal texts first among its entries.
The chronology of the Upanishads is a subject of ongoing scholarly debate, largely because these texts were transmitted orally before being compiled in written form. Scholars primarily estimate their dates by analyzing literary style, vocabulary, and the development of philosophical concepts. Patrick Olivelle asserts that assigning a precise date more specific than several centuries is highly unreliable, characterizing such efforts as "as stable as a house of cards."
Within that uncertainty, Olivelle proposes that the Brihadaranyaka and Chandogya are the earliest, probably predating the Buddha and falling in roughly the seventh to sixth centuries BCE, followed by the Taittiriya, Aitareya and Kaushitaki, probably in the sixth to fifth centuries BCE. Stephen Phillips, summarising Indological opinion, gives a wider range of about 800 to 300 BCE for the early Upanishads and notes that the Shvetashvatara and Mandukya may overlap with the earliest Buddhist and Jain literature.
The Principal Upanishads shift focus away from external rituals to internal contemplation and inquiry. A central theme is the investigation into ultimate reality and the true inner self, sometimes known as Brahman and atman, respectively. Early doctrines of action and causation (karma), cycle of birth and death, and liberation (moksha) are also formulated in the Principal Upanishads. Themes of meditation, breath control, and withdrawal of the senses are also found which eventually lead to the establishment of classical Yoga by Patanjali.
The Principal Upanishads represent a significant shift in ancient Indian thought, moving the focus from external Vedic rituals also known as karmakāṇḍa to internal contemplation, meditative practices i.e.upāsanā, and questions about existence ’jñānakāṇḍa. Instead of rejecting Vedic sacrifice, the early prose Upanishads turn it inward, interpreting bodily functions like breath (‘’prāṇa‘’), speech (‘’vāc‘’), and mind (‘’manas‘’) as connected to cosmic and ritual processes.
The main philosophical focus of the Principal Upanishads is the nature of Brahman, the ultimate and unchanging reality, and Ātman, which is the innermost self or consciousness of each person. The texts describe Brahman using both negative (apophatic) and positive (cataphatic) approaches. In the Bṛhadāraṇyaka Upanishad (2.3.6; 3.9.26), the sage Yājñavalkya explains the absolute with the phrase neti neti ("not this, not that"), showing that ultimate reality goes beyond all descriptions (nirguṇa). Other passages, like those in the Śvetāśvatara Upanishad, describe a personal, all-knowing Lord (īśvara or saguṇa Brahman) who rules the world.
Later Vedantic traditions summarized the connection between Ātman and Brahman in four key sayings called the Mahāvākyas ("Great Sayings"). Each comes from one of the four Vedas found in the Principal Upanishads.
The first organized explanations of the ideas of karma (moral causation), Saṃsāra (rebirth), and mokṣa (liberation) are found in the Bṛhadāraṇyaka (3.2.13; 4.4.5–6) and Chāndogya (5.3–10) Upanishads. The "Doctrine of the Five Fires" (Pañcāgnividyā) describes two paths after death: the "Path of the Ancestors" (pitṛyāna), where ritualists are reborn on earth after using up their merit in the lunar world, and the "Path of the Gods" (devayāna), where those with true knowledge (vidyā or jñāna) escape rebirth completely.
The Principal Upanishads have served as a foundational root text for major schools of philosophy. Post-Vedic Indian philosophies developed through the authorship of commentaries (bhashya) on the Principal Upanishads, along with the Bhagavad Gita and Brahma Sutras, collectively known as the Prasthantrayi. Major schools of Vedanta were established through the commentarial tradition.
In the early modern period, the Principal Upanishads exerted a global intellectual influence. In 1657, Dara Shikoh, the Mughal prince, translated fifty Upanishads from Sanskrit into Persian titled "Sirr-i-Akbar" (The Greatest Secret).
In the 1800s, Dara Shikoh's Persian translation was later translated into Latin by French Indologist Anquetil-Duperron. This Latin translation impacted German philosopher Arthur Schopenhauer and declared that the Upanishads as "the solace of my life" and predicted they would become central in European studies. The Upanishads have also been known to influence American writers Ralph Waldo Emerson and Henry David Theoreau.
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