Verse 90

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यस्मात्परतरंनास्ति ।नेतिनेतीतिवैश्रुतिः ॥मनसावचसाचैव ।सत्यमाराधयेद्गुरुं ॥

In plain words

Than whom there is nothing higher, of whom the śruti says 'not this, not this': him, the guru, let one worship in truth, with mind and with speech.