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"Brahman is OṂ. This whole world is OṂ."
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Taittiriya UpanishadTaittiriya Upanishad
Taittiriya Upanishad
The Taittiriya Upanishad is a Vedic era Sanskrit text, embedded as three chapters (adhyaaya) of the Yajurveda It is a mukhya Upanishad, and likely composed about 6th century BCE