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 Six of Chandogya Upanishad states about the invisibility of an existent object. Uddalaka, the son of Aruna instructed his son Svetaketu, the grandson of Aruna to pour salt in water and keep dissolve it. The following day he asked him to fetch the salted water. Uddalaka then asked his son to separate the salt from the water but Svetaketu could not find any salt in it as it had dissolved in the water. Uddalaka next instructed him to drink the water from the surface level. Svetaketu found it to be salty. He was then told to drink the water from the middle which was again salty. Finally he drank the water from the bottom which was again salty. Thus, the salt remained diluted in the water all the time. Uddalaka, thus, explained that like the salt the body also cannot perceive the Sat (Being) but it remains within it always. The Self can never be separated from the body. This subtle essence exists in all and is the ultimate truth. It is immortal and all powerful.
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