Bhagavad Gita, Chapter 13, Verse 35

They who thus with the eye of knowledge perceive the distinction between the Kshetra and the Kshetrajna, and also the emancipation from the Prakriti of beings, they go to the Supreme.

The chapter closes on the same real distinction it opened with, body and knower, now understood as the actual path out.

Seeing this difference clearly is named as what finally leads to liberation, closing the loop that started with Arjun's very first question. Real understanding here is shown carrying real, practical weight all the way through.