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स एवायं मया तेऽद्य योग: प्रोक्त: पुरातन: ।
भक्तोऽसि मे सखा चेति रहस्यं ह्येतदुत्तमम्  ॥

sa evāyaṃ mayā te’dya yoga: prokta: purātana:
bhakto’si me sakhā ceti rahasyaṃ hy-etad-uttamam – 4.3 

That most ancient spiritual science itself has been divulged to you by me. You are devoted to me; you are also my friend; hence, I felt like revealing to you this most beneficial secret.