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For the text denies the previously declared so-muchness; and declares more than that. It is impossible to understand the text 'not so, not so' as negativing those distinctions of Brahman which had been stated previously. If the text meant that, it would be mere idle talk.
Hence the later passage cannot be meant as a sheer negation, but must be taken as denying the previously described 'so-muchness' of Brahman; i.e. the passage denies that limited nature of Brahman which would result from Brahman being viewed as distinguished by the previously stated attributes only.