I fully believe in the Upanishads. But, is there any teacher who teaches Vedanta, using pure reasoning? I am interested to learn. Thanks.
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Vedanta Paribhasha , a prakarana grantha (introductory treatise) by Shri Dharmaraja Adhvarindra. uses reasoning to teach vedanta– AthreyApr 27 at 15:24
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See Gaudapada's Karika (Commentary) on the Mandukya Upanishad here - wisdomlib.org/hinduism/book/mandukya-upanishad-karika-bhashya– Swami VishwanandaApr 30 at 8:53