Chandogya Upanishad is one of the oldest Upanishad written on the Vedic Brahmana period about ninth to eighth century BC. Chandogya Upanishad is associated with Sama Veda. It is ranked ninth in the Muktika canon of hundred and eight Upanishadas. The 13th Khanda of Chapter Seven of Chandogya Upanishad states about the mantra for meditation and repetition. The hymn states that from the dark `I`, the Self has attained multicolour, from multicolour it has attained blackness. Like the horse which shakes off all dust from its coat, or the moon which escapes from the mouth of Rahu, the Self would also purify its body, and, become free by the help of meditation and attain the Brahmaloka.
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