About this Scripture
The Chandogya Upanishad is a Sanskrit text embedded in the Chandogya Brahmana of the Sama Veda. It is one of the oldest Upanishads. It lists as number 9 in the Muktika canon of 108 Upanishads.
The Upanishad belongs to the Tandya school of the Samaveda. Like Brihadaranyaka Upanishad, the Chandogya is an anthology of texts that must have pre-existed as separate texts, and were edited into a larger text by one or more ancient Indian scholars. The precise chronology of Chandogya Upanishad is uncertain, and it is variously dated to have been composed by the 8th to 6th century BCE in India.
It is one of the largest Upanishadic compilations, and has eight Prapathakas (literally lectures, chapters), each with many volumes, and each volume contains many verses. The volumes are a motley collection of stories and themes. As part of the poetic and chants-focussed Samaveda, the broad unifying theme of the Upanishad is the importance of speech, language, song and chants to man's quest for knowledge and salvation, to metaphysical premises and questions, as well as to rituals.
The Chandogya Upanishad is notable for its lilting metric structure, its mention of ancient cultural elements such as musical instruments, and embedded philosophical premises that later served as foundation for Vedanta school of Hinduism. It is one of the most cited texts in later Bhasyas (reviews and commentaries) by scholars from the diverse schools of Hinduism. Adi Shankaracharya, for example, cited Chandogya Upanishad 810 times in his Vedanta Sutra Bhasya, more than any other ancient text.
Structure
The text has eight Prapathakas (lectures, chapters), each with varying number of Khandas (volume).
Each Khanda has varying number of verses. The first chapter includes 13 volumes each with varying number of verses, the second chapter has 24 volumes, the third chapter contains 19 volumes, the fourth is composed of 17 volumes, the fifth has 24, the sixth chapter has 16 volumes, the seventh includes 26 volumes, and the eight chapter is last with 15 volumes.
The Upanishad comprises the last eight chapters of a ten chapter Chandogya Brahmana text. The first chapter of the Brahmana is short and concerns ritual-related hymns to celebrate a marriage ceremony and the birth of a child.
The second chapter of the Brahmana is short as well and its mantras are addressed to divine beings at life rituals. The last eight chapters are long and are called the Chandogya Upanishad.
A notable structural feature of Chandogya Upanishad is that it contains many nearly identical passages and stories also found in Brihadaranyaka Upanishad, but in precise meter.
The Chandogya Upanishad, like other Upanishads, was a living document. Every chapter shows evidence of insertion or interpolation at a later age, because the structure, meter, grammar, style and content is inconsistent with what precedes or follows the suspect content and section. Additionally, supplements were likely attached to various volumes in a different age.
The second group consists of chapters III - V, with a collection of more than 20 Upasanas and Vidyas on premises about the universe, life, mind and spirituality. The third group consists of chapters VI-VIII that deal with metaphysical questions such as the nature of reality and Self.
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