Sanskrit

स एवायं मया तेऽद्य योगः प्रोक्तः पुरातनः। भक्तोऽसि मे सखा चेति रहस्यं ह्येतदुत्तमम्।।4.3।।

Summary

It is the same ancient path that I have now revealed to you, for you are my devotee and my friend. It is the supreme secret.