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इति ते ज्ञानमाख्यातं गुह्याद्गुह्यतरं मया।विमृश्यैतदशेषेण यथेच्छसि तथा कुरु।।18.63।।
18.63 To you has been imparted by Me this knowledge [Derived in the instrumental sense of 'means of knowledge'; i.e. the scripture Gita.] which is moe secret than any secret. Pondering over this as a whole, do as you like.