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Through the grace of Vyasa I have heard this supreme and most secret Yoga direct from Krishna, the Lord of Yoga, Himself declaring it.

By the grace of Vyasa I heard this supreme secret yoga directly from Krishna, the lord of yoga, as he himself was speaking it.

Sanjaya explains how he heard the dialogue: by the grace of Vyasa, the sage who gave him the power to see and hear events far away. He heard this supreme and secret yoga directly from Krishna, the lord of yoga (yogeśvara), as he spoke it. The verse affirms the authenticity of the account. It also honours Vyasa, traditionally regarded as the compiler of the epic, as the one through whom the teaching reaches the world.