Sanatana Dharma (Hinduism) in its primal form is to be found in the Isha, Kena, Katha, Prashna, Mundaka, Mandukya, Taittiriya, Aitaryeya, Chandogya, Brihadaranyaka, and Svetashvatara Upanishads. These eleven texts (upanishad means “teaching”–literally “that which was heard when sitting near”) are attached to the Vedas, the ancient hymns of the Indian sages, and also knows as Vedanta, the End of the Vedas. The following texts provide useful commentaries on these important scriptures.
by Swami Nirmalananda Giri
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The Katha Upanishad – A Commentary (2 MB)
The Isha Upanishad – A Commentary (844 K)
The Kena Upanishad – A Commentary (208 K)
The Prashna Upanishad – A Commentary (504 K)