Upanishads often quote verses from
the Rig Veda to support their declarations of spiritual knowledge. In the Upanishads the spiritual
meanings of the Vedic texts are brought out and emphasized in their
own right. More specifically the Upanishads are a development from
the Sama Veda and continue to emphasize the ecstasy and the
realization of the revealed knowledge of the Vedas. Some Upanishadic
teachings can be found in the Atharva Veda as well. Most Upanishadic
ideas are found in the Rig Veda, though it follows a different type
of expression.
The classical Upanishads are the
Brihadaranyaka, Chandogya, Isha, Aitareya, Taittiriya, Katha,
Prashna, Kena, Mundaka, Mandukya, Shwetasavatara. These were given
commentaries by great philosopher Shankara many centuries later.
Other early Upanishads are the Kaushitaki, Mahanaryana, Maitri,
Bashkala, Arsheya, Chagala, Shaunaka, Nilarudra. Probably all of
these Upanishads and some others as well pre-Buddhist in nature.
Upanishads continued to be written into fairly recent times and now
several hundred exist. The Bhagavad Gita of Sri Krishna is
considered by many to be an Upanishad as it is a summary of their
teachings.
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