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इदं ते नातपस्काय नाभक्ताय कदाचन।न चाशुश्रूषवे वाच्यं न च मां योऽभ्यसूयति।।18.67।।
18.67 This (that I have taught) you should not ever be taught to one who is devoid of austerities and to one who is not a devotee; also, neither to one who does not render service, nor as well to one who cavils at Me.