Lord Krishna explains prakrti (material nature), purusha (the enjoyer), kshetra (the field), kshetra-jna (the knower of the field), jnana (knowledge), and jneya (the knowable). One who understands the difference between the body, the soul and the Supersoul beyond them both attains liberation. 

His Divine Grace A.C. Bhaktivedanta Swami Prabhupada is uniquely qualified to present this English translation and commentary on Bhagavad-gita. He is the world's foremost Vedic scholar and teacher, and he is also the current representative of an unbroken chain of fully self-realized spiritual masters begining with Lord Krishna Himself. Thus, unlike other editions of the Gita, this one is presented as it is--without the slightest taint of adulteration or personal motivation. This edition is certain to stimulate and enlighten with its ancient yet thoroughly timely message.

Chapter 13 -- Nature, the Enjoyer & Consciousness -- Bhagavad-gita As It Is -- Srila Prabhupada

Madhudvisa