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4. SANSKRIT
http://www.thevedicfoundation.org/valuable_resources/SanskritThe_Mother_of_All_Languages_partIII.htm
The perfection of the pronunciation (of the consonants and the vowels) and the uniqueness of the grammar that stays the same in all the ages from the very beginning of human civilization and up till today are such features which prove that Sanskrit is not manmade; it is a Divine gift to the people of this world
This will bring us to the subject of the date of the Upanishads. All Hindu Scriptures other than the Rig Veda are written in Sanskrit. Essentially therefore they were written down after the second century AD. The backdating of Sanskrit Upanishads is a common form of deceit and is taken by many historians without asking questions and is repeated as though it is a truth. Here are some examples:
http://www.usao.edu/~usao-ids3313/ids/html/hinduism.html "The Upanishads (basic scriptures of Hinduism proper)--records of teachings and discussions of forest hermits, holy men who accomplished the task of transforming Vedism into Hinduism during and after the 6th century B.C.E. The earliest Upanishads date from 900 to 600 B.C.E., and represent the first development of philosophical reflections in Sanskrit literature. According to a widespread tradition the oldest Upanishads are the Isa, Kena, Katha, Prasna, Mundaka, Mandukya, Taittiriya, Aitareya, Chandogya, Brhadaranyaka, Svetasvatara, Kaushitaki, and Maitri Upanishads."
http://www.enotes.com/classical-medieval-criticism/upanishads "Upanishads Vedic texts, circa seventh-fifth century B.C. INTRODUCTION
The Upanishads are ancient texts written in Sanskrit, representing the religious and philosophical tradition of Hinduism and India. Together with the Aranyakas the Upanishads are found at the end of the Vedas, the sacred scriptures of Hinduism, and thus called Vedantas."
http://www.answers.com/topic/upanishads Upanishads, speculative and mystical scriptures of Hinduism, regarded as the wellspring of Hindu religious and speculative thought. The Upanishads, which form the last section of the literature of the Veda, were composed beginning c.900 B.C. Of the 112 extant Upanishads, about 13 date from the Vedic period and the remainder are later, sectarian works.
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