SRI ISOPANISAD (1972) INTRODUCTION
"Vedic knowledge is called sabda-pramāṇa. Another name is sruti. Sruti means that this knowledge has to be received simply by aural reception. The Vedas instruct that in order to understand transcendental knowledge, we have to hear from the authority. Transcendental knowledge is knowledge from beyond this universe." from the Introduction
http://www.krishnapath.org/free-ebooks-audiobooks-of-srila-prabhupada/sri-isopanisad/
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