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4. SANSKRIT
http://www.dishq.org/religions/upanishads.htm
"Some Western scholars have fixed the age of the Upanishads as B.C. 600, or so. They regard that all of them belong to the pre-Buddhist period. This is a sad mistake indeed. The Upanishads are the knowledge portion, or Jnana-Kanda, of the Vedas. They are eternal. They came out of the mouth of Hiranyagarbha, or Brahman. How can one fix the date of the Upanishads? They existed even before the creation of this world." Sri Swami Sivananda
http://www.sanskrit.nic.in/ABOUTSANSKRIT1.htm "As per the Indian tradition Sanskrit Language has no beginning and no ending. It is eternal. Selfborn God has created it. It is divine. It is everlasting. It was first used in Vedas and thereafter it has been the means of expression in other fields."
The eternity of the Sanskrit language and its grammar. (Described on pp. 89-93, 234-243)
It is the language of the Divine abodes. The Divine abodes are inhabited with unlimited Saints who are always drowned in the felicity of the Bliss of their beloved God. The language of these abodes is Sanskrit. So all the prime scriptures (Vedas and Puranas etc.) are in Sanskrit language, and this is also the language of the celestial abodes. The Sanskrit grammar is produced on the earth planet by the eternal Sages along with the Vedas and Puranas.
The True History and the Religion of India: A Concise Encyclopedia of ...
By Swami Prakashanand Saraswati
Thus, every literature that we have in Sanskrit must invariably fall after the first century.
We cannot refute the claims that the literature was in the air long before that time. However, no body can substantiate any such claim. This is therefore definitely applicable to all Upanishads wherein we have the new concept of Brahman, Atman and Iswara
None of the Upanishads could have been written in Sanskrit any time before the first century AD is certain. The concepts themselves are embedded in the vocabulary of Sanskrit.
There was no Sanskrit before 1st CAD
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