Srimad Bhagavad-Gita :
Chapter-13. ( Kshetra-kshetrajna-vibhaga-yogam )
Slokam-1. ( Arjuna question to Lord Sri Krishna ) -
(Arjuna said: O Lord, I wish to know about prakrti [nature], Purusha [the experiencer], and the field and the knower of the field, and of knowledge and the end of knowledge. )
prakrtim purusham caiva kshetram kshetragjnameva ca,
etadveditumicchami jnanam jneyam ca kesava.
arjuna uvaca = Arjuna said;
kesava! = O Lord;
prakrtim purusham ca eva = nature, and the experiencer;
kshetram kshetragjnam ca eva = kshetram (body), and kshetragjnan ( jivatma );
jnanam jneyam ca etat = jnanam ( knowledge ), jneyam ( object of the knowledge, all about these;
veditum icchami = I wish to know.
In this chapter whatever has been previously stated about knowledge, the object of knowledge, prakriti or the material substratum pervading physical existence and the Purusa or the Supreme eternal consciousness is herein being categorically collated and elucidated by Lord Krishna. The means of developing spiritual intelligence through karma or activities was given by Lord Krishna in the first six chapters known as the Karma Yoga section and the means of achieving bhakti or exclusive loving devotion to Lord Krishna was revealed in the subsequent six chapters known as the Bhakti Yoga section along with the different manifestations of the Supreme Lord have all been arranged here together in summation.
The jiva or embodied being is by itself eternal because it possesses an atma or eternal soul bestowed by the Lord Krishna which is an infinitesimal spark from Him; but the physical body although energized by the Supreme Lord is not eternal and disintegrates with time. Therefore the physical body is called sharira because it appears to die and since the Supreme Lord resides within all jivas as the atma He is known as ksetrajna or the consciousness within the ksetra or field of activity. This consciousness envelopes the physical body and is the source of the material senses which display their perceptions of duality in the ksetra of the physical body with emotions of like and dislike, happiness and misery, pleasant and unpleasant, love and hate etc.
To be continued ...