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Upanishads are a grand harmonious and perfectly luminous whole, expressing in its various aspects the single and universal Truth; for under the myriad contradictions of phenomena (prapancha) there is one Truth and one only. All the Smritis, the Puranas, the Darshanas, the Dharmashastras, the writings of Shaktas, Shaivas, Vaishnavas, Sauras, as well as the whole of Buddhism and its Scriptures are merely so many explanations, comments and interpretations from different sides, of these various aspects of the one and only Truth. This Truth is the sole foundation on which all religions can rest as on a sure and impregnable rock;—and more than a rock, for a rock may perish but this endures for ever. Therefore is the religion of the Aryas called the Sanatana Dharma, the Law Sempiternal. Nor are the Hindus in error when they declare the Sruti to be eternal and without beginning and the Rishis who composed the hymns to be only the witnesses who saw the truth and put it in human language; for this seeing was not mental sight, but spiritual. Therefore the Vedas are justly called Sruti or revelation. Of these the Rig, Yajur, Sama & Atharvan are the fertilising rain which gave the plant of the Truth nourishment and made it grow, the Brahmanas are the forest in which the plant is found, the Aranyakas are the soil in which it grows, the Upanishads are the plant itself, roots, stalk, leaves, calix and petals, and the flower which manifests itself once and for ever is the great saying SO AHAM—I AM HE which is the culmination of the Upanishads. Salutation to the SO AHAM. Salutation to the Eternal who is without place, time, cause or limit, Salutation to my Self who am the Eternal.

<ref>http://incarnateword.in/cwsa/17/the-ishavasyopanishad-with-a-commentary-in-english#p4</ref>

==What is Hindu Life?==