केना उपनिषद्

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यन्मनसा न मनुते येना हूर मनो मतं
तदेव ब्रह्म त्वं विद्धि नेदं यदीदम उपासते
That which the mind cannot comprehend,that by which mind is fully encompassed,Know that to be Brahman and not what the people worship as object.