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A very comprehensive Upanishad is this, containing only twelve statements called Mantras, in which the whole wisdom or knowledge of the Upanishads is packed into a nutshell.
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It states bare facts in respect of man in general and Reality in its essential character. It does not give analogies, tell stories or make comparisons. Among the Upanishads, the Mandukya may be regarded as the most important, and it is aptly said, Mandukyam ekam eva alam mumukshunam vimuktaye - for the liberation of the Mumukshu or seeker the Mandukya alone is enough and if you are able to understand the true meaning of this single Upanishad, there may not be a necessity to study any other Upanishad, not even the Chhandogya or the Brihadaranyaka, because the theme of the Mandukya Upanishad is a direct approach to the depths of human nature.
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The Upanishads are secret teachings containing wisdom beyond the realm of the earth and revealing proclamations of the great sages of yore on the nature of Reality. The Vedas, in their form as the Samhitas, constitute an introduction to the subject dealt with in the Vedanta or the Upanishads.
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